Pentair Skimmer Extension Collar | U-3 Skimmer | WC37-503P Free-Standing Fountains The Hayward 6 Position Vari-Flo

The Hayward 6 Position Vari-Flo Valve

Length 19" Outer Diameter 8 7/16" Top Inner Diameter N/A Bottom Inner Diameter 2 1/2" Material 3 oz

Eliminates 1

replacement filter cartridge engineered as a direct drop-in for Intex Type B filter pump systems

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

Pentair Skimmer Extension Collar | U-3 Skimmer | WC37-503P Free-Standing Fountains The Hayward 6 Position Vari-FloThe 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