This is the OEM prefilter strainer pot lid (part #17 on the Pentair UltraFlow Plus exploded diagram) that seals the strainer housing on the suction side of the pump. It closes the pre-filter chamber where the debris basket sits, maintaining prime and keeping the hydraulic circuit under pressure. Without a sound, crack-free lid, the pump loses suction and cavitates.<\/p>\n
The lid threads onto the strainer pot via a quarter-turn bayonet system, creating a watertight seal over the debris basket. You lift it to inspect and empty the basket without tools \u2014 the transparent body lets you assess debris level at a glance before opening. A dedicated lid gasket (R39300600, sold separately) seats into the underside groove and is the first thing to check if the seal weeps.<\/p>\n
This lid fits the full UltraFlow Plus single-phase and three-phase range: models P-UFL-071, P-UFL-073, P-UFL-101, P-UFL-103, P-UFL-151, P-UFL-153, P-UFL-201, P-UFL-203, P-UFL-301, and P-UFL-303. It also fits the Intelliflo UltraFlow VSD (model UFL-VSD) and the Ultra-Glas S5P3R series. Verify your pump model label before ordering \u2014 the lid is not interchangeable with non-UltraFlow Pentair strainer pots.<\/p>\n
UV exposure and pool chemicals degrade the polycarbonate over time, causing hazing, stress cracks, or a warped seating flange. If the pump loses prime repeatedly despite a new gasket, or if you see visible crazing around the bayonet lugs, the lid itself is the fault. A cracked lid draws air into the volute, starving the impeller and triggering thermal cutout on the motor.<\/p>\n
Switch off and isolate the pump, then turn the old lid a quarter-turn anti-clockwise to release it from the bayonet retaining ring (R39105000). Lift out the debris basket, seat the lid gasket into the groove on the new lid, align the lugs with the pot collar, and press down while rotating a quarter-turn clockwise until it clicks. Re-prime and check for weeping at the seal before returning the pump to service \u2014 takes under five minutes with no tools required.<\/p>","protected":false},"excerpt":{"rendered":"