The 1” O-Ring for 375 Backflow Preventers is a replacement inlet housing seal for 1” reduced pressure principle backflow preventers (model 375 and 375XL). This O-ring ensures a watertight seal, preventing leaks and maintaining proper backflow protection. Ideal for routine maintenance or when replacing worn or damaged seals, it helps keep your assembly operating reliably. Made from durable rubber and designed specifically for Wilkins 375 series assemblies, this O-ring is easy to install and built to last.