Tsurumi 50PN2.4S 1/2 HP Water Feature Pump – High-Flow Submersible Pump for Waterfalls, Fountains & Ponds
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The Tsurumi 50PN2.4S (4PN) is a professional-grade, continuous-duty submersible water feature pump manufactured in Japan, delivering 4,740 GPH at open flow with a maximum head of 29 feet. Part of Tsurumi’s VANCS Series, the 50PN2.4S is engineered for ponds, waterfalls, and water features where long-term reliability is non-negotiable. Its 304 stainless steel housing and FRP semi-vortex impeller resist corrosion, while the Double Inside Mechanical Seal with SIC faces, Oil Lifter system (Patent Pending), and V-Ring Seal Protector deliver seal life far exceeding standard submersible pumps. The air-filled motor uses white mineral oil in the sealed chamber — non-toxic to fish — making this pump fully safe for koi ponds and aquatic ecosystems. Permanently lubricated ball bearings rated B-10 at 60,000 hours, built-in thermal protection, and Tsurumi’s 2-Year Warranty back every pump. UL & CSA certified.
Why Choose the Tsurumi 50PN2.4S (4PN)?
- Continuous-duty Japanese engineering: Tsurumi manufactures industrial submersible pumps for construction, wastewater, and water features worldwide. The 50PN2.4S brings that industrial reliability to pond and waterfall applications, rated for 24/7 year-round operation without performance degradation.
- Double Inside Mechanical Seal with SIC faces: Silicon carbide (SIC) faces deliver significantly longer operational life than ceramic or rubber-faced seals common in consumer pumps. The dual inside configuration provides redundant protection against water intrusion.
- Oil Lifter system with white mineral oil (Patent Pending): Tsurumi’s proprietary Oil Lifter delivers food-safe white mineral oil precisely to the seal faces, providing optimized lubrication without immersing the motor in oil. The motor itself is air-filled — a design choice that maximizes heat dissipation for continuous duty.
- V-Ring Seal Protector: A secondary barrier that shields the mechanical seal faces from abrasive particles — important in installations where silt, grit, or organic debris may be present in the water.
- Permanently lubricated sealed ball bearings, B-10 rated 60,000 hours: The B-10 rating means 90% of bearings will exceed this service life. At continuous 24/7 operation, 60,000 hours equals approximately 6.8 years minimum rated life — a published engineering specification, not a marketing claim.
- Semi-vortex FRP impeller passes solids and stringy material: Fiberglass-reinforced plastic (FRP) for abrasion resistance. The semi-vortex design handles solids up to 0.4” and stringy debris without the impeller becoming fouled — critical for ponds with leaves, algae, and organic matter.
- 304 Stainless Steel motor casing + FRP components: The motor housing is 304 SS for corrosion resistance in continuous water immersion. The impeller, volute, and top cover use FRP for lightweight durability and chemical resistance.
- Watertight cable entrance with anti-wicking block: Prevents water migration up the power cable and into the motor housing — a failure mode that ends many lesser pumps prematurely in permanent submersible installations.
Technical Specifications
| Specification | Detail |
|---|---|
| Model | 50PN2.4S (also: 4PN) | SKU 68115 |
| Horsepower | 1/2 HP |
| Voltage / Hz | 115V / 60Hz (also available: 220V) |
| Max Flow Rate | 4,740 GPH (at open flow) |
| Max Head (Shut-Off) | 29 ft |
| Amps (maximum) | 5.8A |
| Watts (maximum) | 667W |
| Discharge | 2” FPT (Female Pipe Thread) |
| Cord Length | 32 ft |
| Height | 15-1/4 inches |
| Diameter | 9-5/8 inches |
| C.W.L. (Min. Submersion) | 4-1/8 inches |
| Weight | 17 lbs |
| Solids Handling | Up to 0.4” (0.394”) |
| Impeller Type | Semi-vortex, FRP (Fiberglass Reinforced Plastic) |
| Motor Type | Air-filled copper wound — continuous duty |
| Motor Housing | 304 Stainless Steel |
| Bearings | Permanently lubricated sealed ball bearings — B-10 rated 60,000 hours |
| Mechanical Seal | Double Inside Mechanical Seal, SIC (Silicon Carbide) faces |
| Seal Lubrication | Oil Lifter system — white mineral oil (fish-safe, Patent Pending) |
| Seal Protector | V-Ring Seal Protector (abrasive particle barrier) |
| Cable Entrance | Watertight with anti-wicking block |
| Thermal Protection | Built-in motor thermal protector |
| Series | VANCS Series |
| Country of Origin | Made in Japan |
| Warranty | 2-Year Warranty from date of purchase |
| Certifications | UL & CSA Certified |
Flow Performance Chart
Performance data for the Tsurumi 50PN2.4S (4PN) at various operating head heights:
| Head Height | Flow Rate | Typical Application |
|---|---|---|
| 0 ft (open flow) | 4,740 GPH | No vertical lift |
| 10 ft | 4,350 GPH | Standard residential waterfall |
| 15 ft | 3,750 GPH | Taller residential or small commercial waterfall |
| 20 ft | 3,120 GPH | High residential or formal water feature |
| 29 ft (max head) | 0 GPH | Maximum head — shut-off point |
Tsurumi PN Series Family
All PN Series pumps share the same VANCS platform: 304 SS casing, FRP semi-vortex impeller, Double Inside Mechanical Seal SIC, Oil Lifter, V-Ring Protector, air-filled motor, B-10 60,000-hr bearings, 2" FPT discharge, 32 ft cord, and 2-Year Warranty.
| Model | Also Known As | HP | Max GPH | Max Head | At 10 ft | At 20 ft |
|---|---|---|---|---|---|---|
| 50PN2.25S | 3PN | 1/3 | 3,540 | ~27 ft | 3,300 | 1,440 |
| 50PN2.4S (this) | 4PN | 1/2 | 4,740 | 29 ft | 4,350 | 3,120 |
| 50PN2.75S | 8PN | 1 | 5,550 | ~43 ft | 5,340 | 4,740 |
Ideal Applications
- Medium-to-large residential waterfalls (10–20 ft head, 3,000–4,500 GPH)
- Commercial and municipal water features requiring continuous-duty reliability
- Formal fountains and architectural water displays
- Pondless waterfall systems in pump vault installations
- Koi ponds and water gardens requiring high-flow recirculation
- Applications where pump failure or downtime is not acceptable
Frequently Asked Questions
What are the performance specs for the Tsurumi 50PN2.4S?
The Tsurumi 50PN2.4S (also called the 4PN) is a 1/2 HP submersible pump with:
- Maximum flow rate: 4,740 GPH (at open flow)
- Maximum head (shut-off): 29 feet
- At 10 ft head: 4,350 GPH
- At 15 ft head: 3,750 GPH
- At 20 ft head: 3,120 GPH
- Maximum amps: 5.8A | Maximum watts: 667W
- Cord: 32 ft | Discharge: 2” FPT
For best pump life, size your installation for 10–20 ft of operating head. For waterfalls above 25 ft, we recommend the 50PN2.75S (8PN, 1 HP). Call (765) 508-4352 for sizing guidance.
Why is the PN Series preferred for fish ponds?
The Tsurumi PN Series is specifically designed for pond and water feature use. Key fish-safe features:
- White mineral oil seal lubrication: The sealed oil chamber uses white mineral oil — a food-safe, non-toxic lubricant. Tsurumi specifically chose white mineral oil so that the pump is safe for garden pond ecosystems even in the unlikely event of a seal failure. This is unlike older pump designs that used petroleum-based oil, which can be harmful to fish.
- Air-filled motor: The motor windings are in an air-filled cavity, not submerged in oil. Only the seal faces receive oil lubrication via the Oil Lifter system.
- 304 Stainless Steel housing: Corrosion-resistant, no leaching of metal contaminants.
- FRP impeller, volute, and top cover: Fiberglass-reinforced plastic components resist chemical breakdown in pond water.
How does the vortex impeller prevent clogging?
The semi-vortex FRP impeller creates a rotating flow pattern that draws debris through the pump without requiring contact between solids and the impeller itself. This allows solids up to 0.4 inches in diameter and stringy material (algae, leaves, fibrous debris) to pass through the pump without clogging.
In pond applications, this means the pump continues operating normally when small leaves, algae strings, or organic debris make it past the intake screen — rather than stalling or requiring manual cleaning to remove a lodged solid. The V-Ring Seal Protector provides additional protection by blocking abrasive particles from reaching the mechanical seal faces.
Does this pump use oil-bath lubrication? Is it safe for fish?
Yes, and yes — but with an important distinction.
The 50PN2.4S uses Tsurumi’s Oil Lifter system (Patent Pending) to lubricate the mechanical seal faces. The Oil Lifter uses white mineral oil — a food-grade, non-toxic lubricant used in food processing and pharmaceutical applications. It is not petroleum-based cutting oil, gear oil, or motor oil.
Per Tsurumi’s own product description: “the white mineral oil used in the oil chamber creates a safe environment for a thriving and safe garden pond ecosystem.”
The motor itself is air-filled — the oil system is separate and sealed, lubricating only the seal faces. Even in the unlikely event of a seal failure, only a small volume of white mineral oil would enter the water — which is safe for koi and aquatic plants.
Is the 50PN2.4S rated for 24/7 operation?
Yes. The 50PN2.4S is a continuous-duty rated pump designed for year-round 24/7 operation. Specific features supporting continuous duty:
- Air-filled copper wound motor — superior heat dissipation for continuous operation vs oil-immersed designs
- Permanently lubricated ball bearings, B-10 rated 60,000 hours — approximately 6.8 years minimum rated bearing life at continuous 24/7 operation (90th percentile)
- Built-in thermal protector — automatically shuts down the motor if it reaches critical temperature, protecting against burnout
- Watertight cable entrance with anti-wicking block — prevents water from migrating up the cord and into the motor housing over years of operation
What are the electrical and plumbing requirements?
Electrical:
- 115V / 60Hz (a 220V version is also available — note voltage when ordering)
- Maximum current: 5.8 Amps
- Maximum power: 667 Watts
- Power cord: 32 feet
- UL & CSA certified
Plumbing:
- Discharge: 2” FPT (Female Pipe Thread) — connect with a 2” male NPT fitting
- Minimum submersion depth (C.W.L.): 4-1/8 inches
- Pump dimensions: 15-1/4” tall × 9-5/8” diameter
Why Buy from Pond Pro Direct?
- Authentic Tsurumi product with full 2-year factory warranty coverage
- Professional water feature expertise — call Mon–Fri 9 AM–5 PM EST for pump sizing and system design
- Price Match on identical products from authorized retailers
Tsurumi 50PN2.4S (4PN) — 4,740 GPH max | 1/2 HP | 667W | 5.8A | 29 ft max head | 2" FPT | 32 ft cord | 15-1/4"H × 9-5/8"D | 17 lbs | white mineral oil Oil Lifter | air-filled motor | B-10 60,000-hr bearings | 304 SS + FRP | VANCS Series | 2-year warranty | UL & CSA | Made in Japan.
Questions about pump sizing for your waterfall or water feature? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.
Price Match
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For more information, please check out Price Match Policy Page
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Custom or Made-to-Order Items
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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
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