Pool Sand Filter Base Drain Cap Fits Pump Systems. Made of quality plastic material with a smooth finish that resists cracking or deformation, providing reliable performance and longlasting durability. Quality materials: durable plastic construction with a smooth finish that resists breaking or deforming, helping ensure consistent filter base performance over time. Easy installation: cap tightens by hand; ridged edges provide a firm grip; tighten until the drain no longer leaks. If leaks persist, apply thread seal tape to the drain port threads. Secure seal: equipped with a quality gasket to deliver a tight seal and prevent leakage or spillage. Grip and handling: edges are designed to provide grip, reducing the chance of the cap slipping during use. Compatibility and use: designed to fit pool sand filter base drain caps for pump systems, suitable for common pool filtration setups. Use scenarios: Routine pool maintenance: drain the base for cleaning or replacing filter media, then reseal to maintain proper operation. System winterization or storage: use the cap to secure the drain and minimize leaks during offseason. Replacement in compatible pump systems: a worn drain cap to restore a tight, leak seal.