Description
Pentair Superflo locking ring R351090
The Pentair Superflo locking ring R351090 is the original threaded clamp ring that secures the pump lid onto the strainer housing of Superflo pool pumps.
It keeps the transparent lid firmly in place, ensuring a reliable seal around the strainer basket area and allowing the pump to maintain prime without air leaks.
Main features of the Pentair Superflo locking ring
- Original Pentair locking ring for Superflo pump strainer lids.
- Threaded design that screws onto the pump body around the lid.
- Ensures uniform pressure on the lid O-ring for a watertight seal.
- Robust plastic construction for daily use in pool plant rooms.
Function and role in the Superflo pump
The locking ring is a key mechanical part of the Superflo pump’s prefilter section. It pulls the clear lid down evenly onto the strainer housing,
compressing the lid gasket and preventing air from entering the suction line. A sound ring helps the pump prime quickly and run quietly under normal
filtration conditions.
- Holds the transparent lid securely against the strainer housing.
- Prevents air leaks that can cause loss of prime and noisy operation.
- Allows easy access to the basket for cleaning and inspection.
Compatibility and typical use
The Pentair Superflo locking ring R351090 is designed specifically for Superflo circulation pumps. It follows the original thread profile and diameter,
so it can be fitted directly in place of the damaged or lost factory ring.
- Compatible with Pentair Superflo pumps that specify reference R351090 as locking ring.
- Suitable as a direct replacement for worn, cracked or seized original rings.
- Ideal when refurbishing the prefilter area together with a new lid and O-ring.
When to replace the locking ring
Although the locking ring is a simple plastic component, its condition directly affects the pump’s ability to seal and hold prime. Over time, exposure
to sun, chemicals and repeated tightening can weaken or deform the ring.
- Cracks, chips or deformation visible on the ring body or handle areas.
- Ring difficult to turn, binding on the thread or jumping when tightening.
- Persistent air bubbles in the pump despite a new lid gasket and correct plumbing.
- Broken tabs or grips that make it hard to remove or refit the lid.
Installation and handling guidelines
Installing the Pentair Superflo locking ring R351090 is straightforward and can be done during routine basket cleaning or maintenance. Careful handling
of the thread and gasket helps ensure a smooth, long lasting seal.
- Switch off the pump before opening the strainer lid.
- Remove the old ring by unscrewing it from the pump body and lifting off the lid.
- Check the lid O-ring and sealing surface, cleaning or replacing the gasket if necessary.
- Place the lid correctly on the strainer housing and screw the new R351090 ring on by hand.
- Tighten evenly until the lid sits firmly, without using tools or over tightening.
After refitting, restart the filtration system and check that the pump primes quickly and that no air is drawn into the strainer housing during operation.
Care and good practice
Good habits around the prefilter area will help the new locking ring and lid last for many seasons.
- Keep the lid O-ring lightly lubricated with a silicone based lubricant suitable for pool gaskets.
- Clean sand and debris from the threads before tightening the ring.
- Avoid striking the ring with tools or using levers to tighten or loosen it.
- Protect the pump from direct sunlight where possible to reduce UV ageing of plastic parts.
With a correctly installed Pentair Superflo locking ring R351090 and a good lid gasket, the pump strainer section remains easy to service and reliably
sealed, supporting stable filtration and quiet daily operation.
