Hayward SP1091CV In-Line Combo Hose Adapter and Check Valve In-line combo hose adapter and check valve Made of ABS plastic material By utilizing the skimmer basket instead of the pump strainer basket, the need to turn the pump on and off has been eliminated Simply attach the appropriate Skim-Vac to the vacuum hose locate over the skimmer basket and begin vacuuming It accepts 1-1/2-inch and 1-1/4-inch pool hose