Rubber construction ensures heat / resistance and long term flexibility, featuring exact 13.8x7.5inch dimensions for seamlessly compatibility with automatic ground pool skimmers Outperforms standard rubber gaskets with 50% extended lifespans, reducing replacement frequency while safeguarding pool hygienes and pumps in harsh conditions Perfectly seals wide mouth butterfly skimmers during routine pool maintenance, seasonal equipment upgrades, or urgent repairs to restores water filtrations efficiency Ideal for pool owners, maintenance technicians, and commercial facilities requiring leakproof solution for automatic skimmers in residential or public environments Engineered with a precisions molded silicone butterfly design, this wide mouth skimmer gasket eliminates leaks and maintains sealing up to 100PSI for SPX1091GW / SP1091LX pool systems