Description
Pentair Superflo pump lid o-ring – R357255 – 37.002
The Pentair Superflo pump lid o-ring R357255 37.002 is the original sealing gasket for the transparent cover of Superflo pool pumps.
This circular seal sits between the pump housing and the clear lid and is essential to keep the prefilter compartment airtight so the
pump can prime correctly and operate without drawing in air.
Main features of the Pentair Superflo lid o-ring
- Original Pentair lid o-ring for Superflo pump strainer covers.
- Designed to match the groove and contact surface of the Superflo prefilter housing.
- Provides an airtight and watertight seal under normal filtration pressure.
- Manufactured from elastomer compatible with chlorinated and salt water pools.
Function in the Superflo pump prefilter
This o-ring works together with the transparent lid and locking ring to seal the prefilter section of the pump. When the locking ring is
tightened, the o-ring is compressed evenly between the lid and housing, preventing air from entering on the suction side and stopping
water from leaking around the cover.
- Ensures the Superflo pump maintains a stable prime during operation.
- Reduces the risk of noisy running and loss of flow due to air ingress.
- Helps keep the technical area dry by preventing drips around the lid.
Compatibility and typical applications
The Pentair Superflo pump lid o-ring R357255 37.002 is designed specifically for Superflo pumps that use the matching transparent cover
and locking ring. It follows the original section and diameter so it fits directly in the lid groove without modification.
- Compatible with Pentair Superflo circulation pumps that specify reference R357255 or 37.002 as lid seal.
- Ideal when refurbishing the prefilter area together with a new lid and locking ring from PoolParthub.com.
- Recommended as a preventive spare to keep on hand for fast replacement during the season.
When to replace the Superflo lid o-ring
O-rings are consumable parts. Exposure to chemicals, temperature changes and repeated tightening gradually affects their elasticity and
sealing performance. Replacing a tired o-ring is a simple way to solve many priming and air leak issues.
- Visible cracks, flattening or cuts on the existing lid gasket.
- Persistent air bubbles in the lid despite correct pipework and water level.
- Water traces or salt deposits forming around the pump cover.
- O-ring that feels hard or brittle instead of soft and elastic.
Installation and maintenance tips
Fitting the Pentair Superflo pump lid o-ring R357255 37.002 is straightforward and can be done during routine cleaning of the strainer basket.
- Switch off the pump before opening the prefilter lid.
- Remove the locking ring and lid, take out the old o-ring and clean the sealing groove and contact surface.
- Place the new o-ring in the groove, making sure it is not twisted or pinched.
- Refit the lid and screw the locking ring on by hand until the cover is held firmly, without over tightening.
- Apply a thin film of silicone based lubricant suitable for pool gaskets to reduce friction and extend the seal life.
After reassembly, restart the filtration system and check that the pump primes quickly and that no air is drawn into the prefilter area.
With a correctly installed Pentair Superflo pump lid o-ring R357255 37.002, the strainer housing remains reliably sealed and daily
operation is quieter and more efficient.
