Flojet 20028-072 Valve Chamber Kit, Santoprene / Nylon
The Flojet 20028-072 is the genuine valve chamber kit combining Santoprene valves with nylon components, carried under the factory designation "Kit V/Chamber Santo Nylon".
The pairing of materials is deliberate. Santoprene is a thermoplastic elastomer with excellent resistance to compression set, which is precisely what a check valve needs: it is clamped and released thousands of times an hour and has to return to flat every single time. Nylon, by contrast, is stiff and dimensionally stable — used where the assembly needs to hold its shape under clamping load rather than flex. Putting each material where its properties belong gives a valve assembly that seals well and stays in shape.
Santoprene also handles a wide temperature range and is tolerant of water, detergents and dilute chemistries, making it a good general-purpose choice. Fit the kit complete rather than replacing individual parts, check the valve seats for scoring while the chamber is apart, and clean or fit a suction strainer if the old valves show cuts or embedded grit. Confirm the part number against the parts breakdown for your pump before ordering.
Key Features
- Genuine Flojet (Xylem) service part — complete valve chamber kit
- Santoprene valves for excellent resistance to compression set
- Nylon components where the assembly needs stiffness and dimensional stability
- Wide temperature range and good tolerance of water, detergents and dilute chemistries
- Factory designation: Kit V/Chamber Santo Nylon
Applications
- Flojet diaphragm pump rebuild and overhaul
- General fresh water, washdown and utility service
- Restoring flow and pressure lost to worn check valves
- Systems operating across a wide temperature range
- Marine, RV, dockside and mobile water systems
Specifications
- Brand: Flojet (Xylem)
- Manufacturer Part Number: 20028-072
- Part Type: Valve chamber kit
- Valve Material: Santoprene
- Other Components: Nylon
- Factory Designation: Kit V/Chamber Santo Nylon
- Condition: New
Frequently Asked Questions
Q: What is compression set and why does it matter here?
It is the permanent deformation an elastomer keeps after being held compressed. A valve with a high set no longer lies flat on its seat, so it leaks even though nothing has visibly broken.
Q: Why not make the whole assembly from one material?
Because the parts do opposite jobs. The valve has to flex constantly; the surrounding structure has to stay rigid under clamping load. No single material does both well.
Q: Is Santoprene suitable for cold conditions?
It holds its flexibility across a wide temperature range, which is one of its advantages over compounds that stiffen noticeably as temperatures drop.
Q: How do I check a used valve is still good?
Lay it on a flat surface. A sound valve sits flat; one that has taken a set shows daylight under an edge or holds a visible curve from its seat.
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 part before you order.
CLRMarine
