Sta-Rite C20-21N Gasket
The Sta-Rite C20-21N is a replacement gasket for Sta-Rite Dyna-Glas/Dyna-Max Series in-ground pool and spa pumps, seated between two machined surfaces inside the pump to seal against water and, on the suction side, against air that would otherwise break the pump's prime.
Gaskets should be replaced any time the joint they seal is opened, even if the old one looks intact, since the compression set that makes a gasket seal in the first place does not fully reverse once the bolts are loosened. Clean both mating surfaces of old gasket material before installing the new one.
Key Features
- Genuine-fit Sta-Rite C20-21N replacement gasket
- Sized for Sta-Rite Dyna-Glas/Dyna-Max Series in-ground pool and spa pumps
- Seals against water leaks and suction-side air leaks that break the pump's prime
- Should be replaced, not reused, any time the joint is opened for service
- Direct fit replacement for the original Sta-Rite part
Applications
- Sealing a weeping leak at a pump housing joint
- Servicing Sta-Rite Dyna-Glas/Dyna-Max Series in-ground pool and spa pumps
- Routine reassembly after any pump teardown that opens this joint
- Fixing a lost-prime issue caused by a suction-side air leak
Specifications
- Brand: Sta-Rite
- Manufacturer Part Number: C20-21N
- Part Type: Gasket
- Fits: Sta-Rite Dyna-Glas/Dyna-Max Series in-ground pool and spa pumps
- Quantity Per Pump: 1
- Condition: New
Frequently Asked Questions
Q: Can I reuse the old gasket if it still looks fine?
It is not recommended. A gasket takes a permanent compression set the first time it is torqued down, so a reused gasket is far more likely to weep than a new one, even if it looks undamaged.
Q: My pump loses its prime overnight. Could this gasket be the cause?
Yes, a gasket leak on the suction side lets air into the pump between uses even though it may not drip visibly while the pump is running. It is one of the first things worth checking for a lost-prime complaint.
Q: Do I need any sealant with this gasket?
No. Sta-Rite gaskets in this class are designed to seal on their own when properly torqued; adding sealant is not necessary and can make future disassembly harder.
Q: Will this fit a different pump in the same series?
Only if the joint dimensions match. Sta-Rite Dyna-Glas/Dyna-Max Series in-ground pool and spa pumps use different gasket sizes across the family, so match the exact part number.
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 gasket.
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