Tsurumi 50PN2.25S 1/3 HP Water Feature Pump – High-Head Submersible Pond & Waterfall Pump
✓ 30-Day Return Period
✓ Price Match - We will Beat Lower Prices!
✓ Secure Encrypted Checkout
✓ Questions? - Call (765) 508-4352
The Tsurumi 50PN2.25S (3PN, SKU 68110) is a professional-grade, direct-drive submersible water feature pump delivering approximately 3,570 GPH at open flow (3,180 GPH at 10 feet of head) with a maximum head height of 30 feet. Rated at 1/3 HP / 529 watts / 4.6 amps, this pump is built for continuous-duty operation in ponds, waterfalls, and koi feature installations where reliability and longevity are non-negotiable. The semi-vortex fiberglass reinforced plastic (FRP) impeller passes solids and stringy debris without clogging while resisting abrasive particle wear. The 304 stainless steel casing provides maximum corrosion resistance in pond environments. A double inside mechanical seal with Silicon Carbide (SiC) faces delivers the longest seal life available. The patented Oil Lifter ensures continuous seal face lubrication using ecosystem-safe white mineral oil — not petroleum-based. B-10 rated sealed ball bearings with a 60,000-hour service life. Watertight anti-wicking cable entrance. Built-in thermal protection. 2-Year Warranty. Made in Japan.
Why Choose the Tsurumi 50PN2.25S?
- Direct-drive oil-free copper wound motor — continuous duty: Unlike magnetic-drive designs that lose performance more quickly as head pressure increases, the direct-drive motor maintains stronger flow through the head pressure range. Rated for 24/7 continuous operation with built-in thermal protection that shuts down before motor damage can occur.
- Semi-vortex FRP impeller — solids-passing without clogging: The semi-vortex design creates a vortex in the volute rather than a direct centrifugal path, allowing small solids and stringy fibrous material to pass through without contacting the impeller. FRP (Fiberglass Reinforced Plastic) construction resists wear even when abrasive particles such as sand or fine gravel are present.
- 304 stainless steel casing — corrosion-free in pond water: Full stainless steel outer housing resists the chlorine, mineral content, algaecides, and bio-compounds present in typical pond water environments, extending pump exterior life significantly beyond painted-iron or ABS plastic alternatives.
- Double inside mechanical seal with Silicon Carbide faces: SiC seal faces provide the longest operational life of any mechanical seal material currently available. The patented Oil Lifter ensures continuous lubrication of the seal faces. A V-Ring Seal Protector shields the seal from abrasive particles in the pumped water — a complete three-layer seal protection system.
- White mineral oil — ecosystem-safe: The oil chamber uses white mineral oil, which is non-toxic and safe for fish, koi, and aquatic plants. If any oil escapes the pump, it does not contaminate the pond ecosystem — a critical design consideration for koi ponds and water gardens.
- B-10 60,000-hour bearing rating: The permanently lubricated sealed ball bearings carry a B-10 life rating of 60,000 hours — meaning 90% of bearings will reach 60,000 hours without failure. At 24/7 continuous operation, that represents nearly 7 years of bearing life before statistical failure risk rises.
- Anti-wicking watertight cable entrance: The power cord entry point uses an anti-wicking block to prevent capillary action from drawing moisture up the cord into the motor housing — a common failure mode in cheaper pump designs.
Technical Specifications
| Specification | Detail |
|---|---|
| SKU / MPN | 68110 / 3PN / 50PN2.25S |
| Horsepower | 1/3 HP |
| Max Flow (open) | ~3,570 GPH (0 ft head) |
| Max Head | 30 ft |
| Wattage | 529W |
| Amps | 4.6A |
| Voltage | 115V |
| Cord Length | 20 ft (watertight anti-wicking entrance) |
| Outlet Size | 2” |
| Dimensions | 9”L × 6”W × 14”H |
| Motor Type | Direct drive, oil-free, copper wound, continuous duty |
| Impeller | Semi-vortex FRP (Fiberglass Reinforced Plastic) — solids-passing, abrasion-resistant |
| Housing | 304 Stainless Steel |
| Mechanical Seal | Double Inside Mechanical Seal with Silicon Carbide (SiC) faces |
| Oil | White mineral oil (ecosystem-safe, non-toxic to fish and aquatic life) |
| Oil Lifter | Patent-pending Oil Lifter — continuous seal face lubrication |
| V-Ring Seal Protector | Yes — protects mechanical seal from abrasive particles |
| Bearings | B-10 rated, 60,000-hour service life — permanently lubricated, sealed |
| Thermal Protection | Built-in thermal overload |
| Installation | Submersible; fits most skimmer boxes and pump vaults |
| Electrical | Requires GFCI-protected 115V outdoor outlet |
| Warranty | 2-Year Limited from date of purchase |
| Made in | Japan |
Performance at Head Height
Flow rate decreases as head height (vertical rise plus plumbing friction) increases. Size your pump for the actual head height of your installation, not the maximum open-flow rating:
| Head Height | Flow Rate | Notes |
|---|---|---|
| 0 ft (open flow) | ~3,570 GPH | Maximum with no head pressure |
| 10 ft | 3,180 GPH | Typical single-level waterfall |
| 15 ft | 2,610 GPH | Moderate head applications |
| 20 ft | 1,800 GPH | Elevated waterfall installations |
| 30 ft | 0 GPH (max head) | No flow at or beyond this height |
Note: Plumbing friction from tubing length, elbows, and fittings reduces effective flow rate in addition to vertical head height. Always account for total dynamic head (TDH) when sizing, not just static height.
Tsurumi PN Series — Choose by HP and Flow
All PN/2PU/2OM series pumps share: direct-drive construction, FRP semi-vortex impeller, 304 SS housing, SiC mechanical seal, white mineral oil, B-10 bearings, anti-wicking cable, 2-year warranty, Made in Japan.
| Model | SKU | HP | GPH @ 10 ft | Max Head | Watts/Amps | Dimensions |
|---|---|---|---|---|---|---|
| 2OM | 68100 | 1/5 | 1,980 GPH | 28 ft | 368W / 3.2A | 8"×6"×12"H |
| 2PU (50PU2.15S) | 68105 | 1/5 | 2,880 GPH | 20 ft | 372W / 3.1A | 9"×6"×15"H |
| 3PN / 50PN2.25S (this) | 68110 | 1/3 | 3,180 GPH | 30 ft | 529W / 4.6A | 9"×6"×14"H |
| 4PN (50PN2.4S) | 68115 | 1/2 | 4,350 GPH | 43 ft | 667W / 5.8A | 9"×6"×14"H |
| 8PN (50PN2.75S) | 68120 | 1 | 5,400 GPH | 55 ft | 1000W / 8.7A | 9"×6"×15"H |
| 12PN | 68125 | 1 | 7,600 GPH | 23 ft | 1032W / 8.7A | 12"×8"×15"H |
Frequently Asked Questions
What is the flow rate of the Tsurumi 50PN2.25S at different head heights?
The Tsurumi 50PN2.25S delivers approximately 3,570 GPH at open flow (zero head pressure). At operating head heights, performance is:
- 3,180 GPH at 10 feet — suitable for most single-waterfall installations
- 2,610 GPH at 15 feet
- 1,800 GPH at 20 feet
- Maximum head: 30 feet (no flow beyond this height)
When calculating your head requirement, add vertical rise + approximately 1 foot of head for every 10 feet of horizontal pipe run, plus additional resistance for elbows and fittings. Call us at (765) 508-4352 for help calculating your system head.
Is the Tsurumi 50PN2.25S safe for koi ponds and fish?
Yes — the Tsurumi PN series pumps are specifically designed for ecosystem-safe operation. The oil chamber uses white mineral oil, which is non-toxic and does not harm fish, koi, or aquatic plants if it enters the water column. This is a key difference from pumps that use petroleum-based oils, which can be harmful to pond life.
The stainless steel housing eliminates the risk of heavy metal leaching from cast iron or painted surfaces. All materials in contact with pond water (FRP impeller, 304 SS casing) are inert and chemically resistant to pond chemistry including pH adjusters, algaecides, and biological treatments.
How does the semi-vortex FRP impeller work?
The semi-vortex impeller creates a vortex pattern in the pump volute rather than a direct centrifugal path through the impeller blades. This means water and debris move through the pump without direct contact with the impeller faces — allowing small solids, leaves, twigs, and stringy algae to pass through without clogging.
The Fiberglass Reinforced Plastic (FRP) construction significantly extends impeller life compared to standard plastic: when abrasive particles such as fine sand, gravel dust, or mineral deposits are present in the water (common in koi ponds and natural water features), the fiberglass composite resists wear that would degrade a standard plastic impeller within months.
What makes the Tsurumi seal system different from other pumps?
Tsurumi uses a three-layer seal protection system unique to their PN series:
- Double Inside Mechanical Seal with Silicon Carbide (SiC) faces: SiC is the hardest commercially available seal face material, providing the longest operational seal life of any configuration currently available. The double-inside design means two seals work in tandem for redundant protection.
- Patent-pending Oil Lifter: Continuously delivers white mineral oil to the seal faces, ensuring lubrication even during high-demand operation when conventional splash-lubricated seals run dry.
- V-Ring Seal Protector: A flexible elastomeric ring positioned ahead of the mechanical seal that deflects abrasive particles away from the seal face before they can cause scoring or premature wear.
Together, these three components eliminate the primary failure modes of submersible pump seals: wear, dry-running, and abrasion.
How long do Tsurumi pumps last, and what is the warranty?
All Tsurumi PN series pumps carry a 2-year limited warranty from date of purchase. Tsurumi backs this with US-based technical support and parts availability.
The design life expectations are significantly longer than the warranty period. The B-10 60,000-hour sealed ball bearing rating means that statistically, 90% of these bearings will reach 60,000 operating hours before failure — approximately 6.8 years at 24/7 continuous operation. When all three seal protection layers are intact, seal failure is correspondingly rare.
Tsurumi has manufactured submersible pumps in Japan since 1952, and their PN series pumps are widely considered the professional standard for pond and waterfall applications.
Will the Tsurumi 50PN2.25S fit inside a skimmer box?
Yes — at 9”L × 6”W × 14”H, the 50PN2.25S fits inside most standard skimmer boxes and pump vaults. The compact form factor and 2” outlet makes plumbing straightforward with standard 2” flexible pond tubing or schedule 40 PVC. The 20-foot power cord accommodates skimmer installations with the outlet positioned away from the water feature.
Note: The 14” height (taller than 2OM/2PU models) should be measured against your skimmer box interior depth before ordering. Contact us at (765) 508-4352 to confirm fitment for your specific skimmer.
Why Buy Tsurumi Products from Pond Pro Direct?
- Authentic Tsurumi products with 2-year warranty and US-based service support
- Pump sizing expertise — call for head pressure calculations, skimmer compatibility checks, and PN series sizing guidance
- Price Match on identical products from authorized Tsurumi dealers
Tsurumi 50PN2.25S (3PN, SKU 68110) — 1/3 HP | ~3,570 GPH | 30 ft max head | 529W | 4.6A | 115V | 20 ft cord | 2” outlet | 9"×6"×14"H | direct drive | FRP semi-vortex impeller | 304 SS housing | SiC double mechanical seal | Oil Lifter | V-Ring seal protector | white mineral oil | B-10 60K hr bearings | anti-wicking cable | thermal protection | 2-year warranty | Made in Japan. GFCI-protected outlet required.
Questions about pump sizing, head pressure, or skimmer box compatibility? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.
Price Match
At Pond Pro Direct, we want you to shop with confidence, knowing you’re always getting a good deal.
We will match or beat the lowest online price on its products.
If you find a lower price for any products on our store, we will beat it by $50 for products listed over $2000. In order to be eligible, you must provide proof, whether a screenshot, invoice, email, etc. of the lower offer.
Please note that this does not apply to every product in the store, so reach out via email or chat for confirmation before purchasing.
For the policy to apply, simply send us a screenshot, link, or any other proof of the lower price.
For more information, please check out Price Match Policy Page
Shipping & Delivery
Order Processing
Orders are processed within 1–5 business days, depending on product type, brand, and fulfillment method. Products sold on Pond Pro Direct ship directly from manufacturers or authorized distribution partners and do not ship from a single centralized warehouse.
Processing times may vary by brand, item type, fulfillment method, and whether an item is made to order or ships via freight.
Order Confirmation
After placing your order, you will receive an order confirmation email confirming that we have received your order and pre-authorized your payment method.
Once your order is received, we contact the manufacturer or distribution partner to confirm availability and fulfillment timelines.
- If an item is unavailable or on backorder, we will notify you by email and void the pre-authorization.
- If the item is available, the payment will be processed and the order submitted for shipment.
Order Shipment
If your order is in stock and payment is processed, it will typically ship within 6–13 business days. Once your order ships, tracking information (when available) will be sent to the email address provided at checkout.
If you do not receive shipping confirmation within 6 business days, please contact us at support@pondprodirect.com.
Shipping Destinations
At this time, we primarily ship within the United States. Some products may be available for shipment to Canada. If the website allows checkout and accepts your shipping address, the product is eligible for delivery to that location.
Changing Your Shipping Address
Address changes after an order has been processed or shipped may result in delays or additional carrier fees. Any carrier charges associated with address changes are the responsibility of the customer.
Shipping Times
All shipping times are estimates only and not guarantees.
- Typical handling time: 1–5 business days
- Typical transit time after shipment: 5–8 business days
- Estimated delivery window: 6–13 business days
Delivery timelines may vary based on brand, item type, production status, freight requirements, and carrier availability.
If an order is cancelled after it has been processed or shipped, the customer may be responsible for applicable shipping charges, freight fees, carrier return fees, and warehouse handling costs, where applicable.
Shipping Options
Available shipping options vary by product and location.
Our standard Curbside Delivery option is provided at no additional cost where applicable and delivers the item to the curbside or driveway of the delivery address.
Additional options, such as Threshold Delivery or White Glove Delivery, may be available for select products and locations.
For full details regarding freight delivery, inspection requirements, liftgate service, returns, and customer responsibilities, please review our full Shipping Policy page.
Returns & Refunds
Cancellations & Refunds
Orders may be canceled free of charge before shipment, unless the item is classified as Custom or Made-to-Order (see below).
If you have questions about your order, please contact us at support@pondprodirect.com or call (765) 508-4352 during business hours.
Cancellations (Before Order Ships)
If you need to cancel an order before it ships, please contact us as soon as possible. Orders canceled prior to shipment are eligible for a full refund.
You can reach our team by phone at (765) 508-4352, via live chat on our website, or by email at support@pondprodirect.com.
Cancellations (After Order Ships)
Once an order has shipped or entered fulfillment, it may no longer be eligible for cancellation. If you no longer wish to keep the item, you must wait until delivery and then request a return.
A Return Merchandise Authorization (RMA) is required before returning any item.
Custom or Made-to-Order Items
Custom or made-to-order products are produced specifically for your order and cannot be canceled or refunded once production has begun, except in cases of defect or error.
Product pages will clearly indicate when an item is custom or made-to-order. If you are unsure whether an item falls into this category, please contact us before placing your order.
Returns & Refunds
Returns are subject to the following conditions:
- Customers have 30 days from delivery to request a return, unless otherwise stated on the product page or by manufacturer policy
- Items must be unused, uninstalled, and in original packaging
- An RMA is required prior to returning any item
Because we ship products directly from manufacturers, return eligibility may vary by brand. If a manufacturer does not permit returns on a specific product, we may be unable to accept the return. Please contact us if you would like confirmation of return eligibility for a specific item.
Fees & Shipping Costs
- Return shipping costs are the responsibility of the customer unless the item is defective or shipped in error
- Freight / LTL shipments may incur higher return shipping costs due to carrier fees
- Approved returns of non-defective items may be subject to a restocking fee of up to 25%
- Original outbound shipping charges are non-refundable
If you are exchanging an item rather than returning it outright, we may be able to assist with some costs depending on the product and manufacturer.
For full details, including freight deliveries, damage reporting requirements, and manufacturer-specific terms, please review our complete Return and Refund Policy
