The Pentair 191479 O-Ring Replacement Filter is a vital component for keeping HVAC systems running smoothly. Made of sturdy black rubber, this O-ring is essential for sealing connections in a variety of HVAC equipment, such as air filters, pumps, and other filtration systems. The O-ring keeps air, water, or refrigerant from escaping by offering a tight, leak-proof seal, preserving pea... https://www.usapoolshop.com/191479-pentair-o-ring-replacement-filter