Pentair Skimmer Extension Collar | U-3 Skimmer | WC37-503P Free-Standing Fountains If your heater model number

If your heater model number ends in ASME

The Hayward 6 Position Vari-Flo Valve

maintaining the sealed fluid path that delivers suction from the pool's circulation system to the cleaner head

Your Waterway Front Access Skimmer requires 2 cartridges for a complete service

4-water guns for extreme water fun

Pentair Skimmer Extension Collar | U-3 Skimmer | WC37-503P Free-Standing Fountains If your heater model numberThe Pentair Skimmer Extension Collar (WC37 503P) is the OEM replacement collar for the Pentair U 3 Skimmer series, designed specifically for vinyl liner pool installations. The extension collar raises the skimmer body to the correct height relative to the vinyl liner surface, ensuring the weir door operates at the proper water level and the skimmer face plate seats flush against the liner. When the collar is cracked, warped, or missing, the skimmer