Oberdorfer 300BP Bronze Self-Priming Centrifugal Pump End
The Oberdorfer 300BP is a rugged, close-coupled centrifugal pump end built from corrosion-resistant bronze, designed to move water and other compatible fluids reliably in tight equipment spaces. It self-primes up to 15 feet without a foot valve, or up to 25 feet when a foot valve is added, so it can pull fluid up from a sump, tank, or below-deck space without manual priming. A Buna-N/ceramic mechanical shaft seal keeps the pump running leak-free at temperatures up to 212°F, while the 1" NPT inlet and discharge ports make it a straightforward drop-in replacement for many existing centrifugal pump setups.
Because it ships as a pump end only, the 300BP is meant to be paired with a standard NEMA 56J footed motor in the 1/3 to 3/4 HP range, giving installers flexibility to match the pump to the motor they already have on hand or the exact speed and horsepower their system calls for. This makes it a practical choice not just for boat owners handling air conditioning and bilge duty, but also for facilities managers and equipment builders who need a dependable bronze centrifugal pump for industrial HVAC loops, coolant circulation, or general water and glycol transfer.
With ball bearings that are permanently greased and an O-ring housing seal that eliminates the gasket maintenance older pump designs require, the 300BP is built to run for long stretches with minimal upkeep. Whether it's circulating seawater through a marine AC condenser or moving glycol through a commercial cooling system, this pump end delivers consistent flow and pressure without the added cost or complexity of an integrated motor.
Key Features:
- Self-priming to 15 feet without a foot valve, or 25 feet with one
- Bronze pump body and impeller for strong corrosion resistance
- Buna-N/ceramic mechanical shaft seal rated to 212°F
- O-ring housing seal design eliminates traditional gasket wear points
- Permanently greased ball bearings for low-maintenance operation
- Close-coupled design built for standard NEMA 56J footed motors
Applications:
- Marine air conditioning and refrigeration circulation
- Bilge pumping and seawater handling
- Industrial and commercial HVAC circulation systems
- General water, glycol, and mild solvent transfer
- Coolant and chemical circulation in industrial equipment
Specifications:
- Port Size: 1" NPT inlet and discharge
- Flow Rate: Up to 22 GPM
- Maximum Pressure: 14 PSI
- Suction Lift: 15 ft without foot valve / 25 ft with foot valve
- Maximum Temperature: 212°F (Buna-N seal)
- Maximum Viscosity: 2,000 SSU
- Motor Requirement: NEMA 56J footed motor, 1/3–3/4 HP, 3450 RPM
- Materials: Bronze body and impeller, 416 stainless steel shaft, Buna-N/ceramic mechanical seal
Frequently Asked Questions
Q: Does the Oberdorfer 300BP include a motor?
A: No. The 300BP is a pump end only and requires a separate NEMA 56J footed motor, typically 1/3 to 3/4 HP at 3450 RPM.
Q: Is the Oberdorfer 300BP only suitable for marine use?
A: No. While it's a popular choice for marine air conditioning and bilge systems, it's equally well-suited to industrial HVAC circulation, general liquid transfer, and other commercial applications.
Q: Can the 300BP be run dry?
A: It should not be run dry for any extended period, since this can quickly damage the mechanical shaft seal and shorten the pump's service life.
Q: What kinds of fluids can this pump handle besides water?
A: The 300BP can handle seawater, glycol solutions, mild solvents, and other commercial fluids that are compatible with bronze construction and a Buna-N seal.
Q: Does the 300BP need to be mounted in a specific orientation?
A: Yes. It's designed for horizontal mounting to maintain proper priming and bearing lubrication during operation.
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