Pentair Square Spa Skimmer Weir Door with Foam (550-4051) valterraproducts this MasterTemp/Max-E-Therm O-Ring Kit [After

this MasterTemp/Max-E-Therm O-Ring Kit [After 1/12/2009] is built for that role

Supports cleaner and more dependable pump maintenance

Use this part when the original label is missing

Helps restore maintained-state single-pole switching

Pentair Square Spa Skimmer Weir Door with Foam (550-4051) valterraproducts this MasterTemp/Max-E-Therm O-Ring Kit [AfterThe Waterway Square Spa Skimmer Weir Door with Foam is a replacement skimmer component for compatible square spa skimmer assemblies. The weir door helps improve surface skimming by controlling water movement into the skimmer opening, while the foam helps the door float and respond properly as water level and flow conditions change. A damaged or missing weir can reduce skimming efficiency and allow debris to drift back into the spa. Replace this part