Description
Pentair diffuser screw set R355334 for Challenger, Pinnacle and Superflo pumps (3 pieces)
The Pentair diffuser screw set R355334 is the original fixing hardware used to secure the diffuser inside compatible Pentair pool pumps.
Supplied as a set of three screws, it restores the correct, even clamping of the diffuser to the pump housing, helping to maintain proper
hydraulic performance and quiet, reliable operation.
Main features of the Pentair diffuser screw set
- Original Pentair diffuser screw kit with three matching screws.
- Designed for Challenger, Pinnacle and Superflo pool pumps.
- Correct thread, length and head profile for the factory diffuser and housing.
- Suitable for chlorinated and salt water pool environments.
Function and role in the pump wet end
The diffuser surrounds the impeller and shapes the water flow from suction to discharge. The R355334 screws hold this component firmly
against the pump housing so that clearances remain within design tolerances. Using the correct original screws helps prevent vibration,
noise and loss of performance caused by a loose or misaligned diffuser.
- Securely fixes the diffuser to the pump housing at three points.
- Maintains optimal impeller to diffuser gap for efficient flow.
- Reduces the risk of internal movement and wear during operation.
Compatibility and typical applications
The Pentair diffuser screw set R355334 is intended for several Pentair pump ranges that share a similar diffuser fixing pattern. It is
the correct replacement whenever the exploded parts diagram lists R355334 as diffuser screw set for your model.
- Compatible with selected Pentair Challenger pumps.
- Compatible with Pentair Pinnacle pumps that use the same diffuser design.
- Compatible with Pentair Superflo pumps specified for R355334 screws.
- Ideal when refurbishing the wet end or replacing missing or corroded screws.
When to replace diffuser screws
Diffuser screws work in a warm, humid technical environment and are exposed to vibration and occasional chemical vapours. Over time,
they can corrode, seize or suffer damaged heads, making service more difficult and reducing the quality of the diffuser fixing.
- Corrosion, rust or deposits visible on the screw shank or head.
- Rounded or damaged heads that no longer accept the correct tool.
- Missing screws or non original replacements of the wrong size or thread.
- Wet end overhaul where all internal fixings are renewed preventively.
Installation guidelines
Installing the Pentair diffuser screw set R355334 is normally done when the pump is opened for maintenance, seal replacement or internal
cleaning. All work should be carried out with the system depressurised and the electrical supply isolated.
- Switch off and isolate the power to the pump and relieve pressure in the system.
- Separate the wet end from the motor and remove the impeller according to the manufacturer’s procedure.
- Position the diffuser correctly on the pump housing, aligning the mounting holes.
- Insert the new R355334 screws and tighten them evenly by hand with the appropriate screwdriver.
- Avoid overtightening to prevent stripping threads or deforming the diffuser body.
After reassembly of the wet end and motor, prime the pump and check for smooth, quiet operation, confirming that there is no internal
rattling or abnormal vibration.
Good practice for reliable pump service
Using original specification screws and following good maintenance practice helps keep Challenger, Pinnacle and Superflo pumps operating
reliably over many seasons.
- Replace corroded or damaged diffuser screws whenever the wet end is open.
- Ensure all three fixing points are equipped with identical R355334 screws.
- Inspect internal fixings during annual service and renew them if they show visible wear.
- Keep the technical room well ventilated to limit corrosion on metal components.
With a new Pentair diffuser screw set R355334 correctly installed, the diffuser remains firmly in place, helping the pump maintain its
designed hydraulic performance and long term reliability.
