Hayward DOME

The Hayward Dome, specifically the top closure or access cover (such as the SX200K or SX244K), is a critical pressure-containing component designed for high-rate sand filtration systems like the ProSeries and S200/S240 models. Injection-molded from a heavy-duty, reinforced thermoplastic, this domed lid is engineered to provide a vacuum-tight seal at the top of the filter tank, allowing pool owners to inspect the internal diffuser or perform maintenance without fully disassembling the plumbing. The "dome" shape is strategically used to evenly distribute the significant hydraulic pressure generated during the filtration and backwash cycles, preventing structural fatigue or localized stress points. These covers typically feature large, coarse buttress threads for a secure grip and are often fitted with a manual air relief valve and pressure gauge port to ensure safe system operation. Built to be weather-resistant and impervious to UV rays and corrosive pool chemicals, the dome ensures the longevity and efficiency of the filter housing. For shipping and logistical purposes, the estimated weight of a standard Hayward Dome assembly is approximately 5.3 pounds in its retail packaging, while the actual dry weight of the dome component itself is roughly 4.4 pounds.