Description
R355389 Screws And Impeller Gasket For Challenger Pinnacle And Superflo Pumps Pentair
The Pentair R355389 screws and impeller gasket kit is an original hardware and sealing set for selected Challenger, Pinnacle and Superflo pool pumps.
This kit combines the impeller face gasket with the dedicated fixing screws, making it easy to restore a correct seal and secure mounting of the diffuser
and impeller assembly during a wet end overhaul.
Main Features Of The R355389 Screws And Gasket Kit
- Original style Pentair impeller gasket and screw set for multiple pump ranges.
- Includes the dedicated impeller gasket plus matching fixing screws.
- Designed for use in chlorinated and salt water pool systems.
- Direct fit with the existing Pentair Challenger, Pinnacle and Superflo wet end components.
Function Of The Impeller Gasket And Screws
Inside the pump wet end, the impeller gasket creates a controlled sealing interface between the impeller, diffuser and housing. The associated screws hold
these components firmly together so internal clearances remain within design tolerances. A sound R355389 kit helps the pump maintain its original hydraulic
performance, reducing noise, vibration and the risk of leaks.
- Seals the mating faces around the impeller and diffuser to avoid internal bypass.
- Helps the pump build and maintain the correct discharge pressure.
- Ensures the diffuser is clamped evenly, protecting the impeller from contact.
- Contributes to stable, quiet operation in residential pool installations.
Compatibility With Pentair Pumps
The screws and impeller gasket kit R355389 is intended for a family of Pentair pumps that share the same internal layout and fixing pattern. It is listed in
official spare parts diagrams as the dedicated screws and gasket set for the impeller and diffuser zone.
- Compatible with selected Pentair Challenger pumps that specify R355389.
- Suitable for Pentair Pinnacle pumps using the same impeller and diffuser arrangement.
- Used on Pentair Superflo models designed for this screw and gasket combination.
- Ideal for pumps installed in private pool systems supplied through PoolParthub.com.
Always check the identification plate on the pump and cross reference with the parts breakdown. If the kit is shown as “R355389 screws + impeller gasket”,
this is the correct replacement set.
When To Replace The Impeller Gasket And Screws
Both the elastomer gasket and metal screws are exposed to water, chemicals and vibration. Over time the gasket can harden or deform, and screws can corrode
or lose their head profile, affecting sealing and mechanical stability.
- Visible flattening, cracks or cuts on the existing impeller gasket.
- Loss of pressure or reduced flow after ruling out basket, filter and pipework issues.
- Corroded, seized or mismatched screws around the diffuser and impeller zone.
- Any major wet end service such as mechanical seal or impeller replacement.
Installation Guidelines
Installing the Pentair R355389 screws and impeller gasket kit is part of a normal wet end refurbishment. The work must always be carried out with the
electrical supply isolated and the hydraulic circuit depressurised.
- Switch off and isolate the power to the pump and close the relevant valves.
- Drain the pump housing and separate the wet end from the motor following the Pentair procedure.
- Remove the impeller and diffuser, then take out the old gasket and screws.
- Clean all mating surfaces and inspect the impeller, diffuser and housing for additional damage.
- Position the new impeller gasket R355389 in the correct location, ensuring it lies flat without twists.
- Reinstall the diffuser and fit the new screws from the kit, tightening them evenly without overtightening.
- Reassemble the pump, reconnect pipework, prime and test for normal pressure and quiet operation.
Good Practice For Long Term Reliability
Correct operating conditions and periodic inspection help the new gasket and screws to provide reliable service over many seasons.
- Maintain balanced water chemistry to reduce chemical stress on elastomers and metal parts.
- Avoid running the pump dry, which can overheat internal components and damage the gasket.
- Plan gasket replacement whenever the pump is opened for mechanical seal or impeller service.
- Check internal fixings and seals during annual maintenance and renew them at the first signs of wear.
With a correctly installed Pentair R355389 screws and impeller gasket kit, Challenger, Pinnacle and Superflo pumps regain a secure internal seal and
stable, efficient hydraulic performance for everyday pool filtration.
