1. Good Compatibility: This pool piston valve hose adapter is compatible and fits with filter pumps, including models for 28635EG, 28633EG, 28671EG, 28645EG, 28647EG, 28651EG, 28677EG, and 28681EG. 2. Multifunctional: This pool piston valve replacement is versatile, featuring an internally threaded collar that universally fits 1.5inch pool outlets, and a male connector at the bottom that accommodates a 1.5inch inner hose. Additionally, it can be connected to a hose at the bottom using a 1.25inch clamp to expand its compatibility. 3. PVC Material: This swimming pool pump valve replacement is made of quality PVC material, which is sturdy, wearresistant, and not easily damaged, ensuring safety and professional performance. 4. Easy to Use: This pool filter pump valve replacement is userfriendly, equipped with a rotating knob that facilitates opening and closing, allowing for more efficient piston movement and hassle pool maintenance.