Function: This accessory is used to temporarily block the swimming pool to prevent water leakage and facilitate the installation and disassembly of swimming pool water pipes Replace for: This hole plug replacement strainer hose for swimming pools that do not have piston valves, so you can replace the filters in the pumps Feature: Replacement is purchased when the original part is lost or broken; made of plastic, it can be used to block the drainage outlet with a good seal, for use with swimming pools, above ground pool part 1.25" diameter: These plugs are used for swimming pools which accept 1.25" diameter hoses which do not have piston valves to shut off water during filter changing It is used to replace the filter pump and retain water during filter cleaning the pump Delivery quantity: 1 pieces