Pool Filter Drain Plug Replacement: This 1.5 inch threaded drain plug is designed to prevent pipe damage from expanding frozen water. It comes with a hose cap and 1.5 inch threads, making it compatible with most pool filters from and other brands. Anti-freeze cap with O-ring: with O-ring included, this pool cap provides a secure, leak-proof seal to effectively winterize above-ground and in-ground pools during the winter months. It is ideal for maintaining the integrity of the pool in freezing weather. WIDE COMPATIBILITY: This replacement cover fits a variety of pool filter models, including the D.E Above Ground Pool and Spa Filter, Clean & Clear Cartridge Filter, Clean & Clear Plus Pool and Spa Filter, FNS Plus and PLM, the modular cartridge filter model 2 3. It is also suitable for PLD modular media pools, 2 and 3 D.E filter models and 3 models of pool and spa sand filters. DURABLE AND RELIABLE: Made of plastic, this pool filter drain plug is durable and can withstand pool