MEDIA DRAIN CAP O-RING

The Hayward Media Drain Cap O‑Ring is a rubber sealing ring intended to sit inside the drain cap (or “media drain” port) of a pool or spa filter tank made by Hayward. Its job is to compress against the drain‑port opening when the cap is tightened, forming a watertight seal that keeps water—and the pressure within the filter tank—from leaking out during normal operation. Without a properly functioning O‑ring, the drain port would be prone to leaks, which can reduce filtration efficiency, waste water, or risk damage to the filter housing. The O‑ring is designed to resist pool chemicals, water, and the pressure changes typical in filtration systems, ensuring reliable sealing over repeated use and maintenance cycles.