The Jabsco 20404770 is a genuine Jabsco upper housing for Jabsco diaphragm pumps. The upper housing forms the pumping chamber above the diaphragm and holds the inlet and outlet check valves, so it has to seal perfectly against the diaphragm to build pressure and hold prime.
A cracked housing, a damaged valve seat or a warped sealing face will cause leaks, air in the lines and a pump that runs without delivering. Replacing the upper housing with the correct genuine part restores the sealing surfaces and valve seats and returns the pump to steady, quiet operation.
Key Features
- Genuine Jabsco replacement upper housing
- Forms the pumping chamber and holds the check valves
- Fresh sealing surfaces for reliable pressure and prime
- Replaces cracked or freeze-damaged housings
- Direct replacement for the original part
Applications
- Jabsco diaphragm pumps that list part 20404770
- Repairing a housing cracked by freezing
- Fresh water, washdown and transfer diaphragm pumps
- Marine, RV and utility pump rebuilds
Specifications
- Part Number: 20404770
- Part Type: Upper housing
- Brand: Jabsco
- Pump Type: Diaphragm pump
Frequently Asked Questions
Q: What usually damages an upper housing?
Freezing water trapped in the pump is the most common cause. Overtightened fittings and over-pressure from a blocked outlet can also crack a housing.
Q: How do I prevent freeze damage next season?
Drain the pump and lines, or run a non-toxic antifreeze through the system when winterizing.
Q: Do I need to replace the check valves too?
Inspect them while the pump is apart. If the valves are worn or dirty they will cause the same symptoms as a damaged housing.
Q: What should I have ready before starting the repair?
Have the pump model number from the label, basic hand tools, and any worn seals or valves ready so the pump only needs to be opened once.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct diaphragm pump upper housing.
CLRMarine
