16741-PG7-005 O-Ring - Overview. The 16741-PG7-005 O-Ring is a critical sealing component supporting the fuel system in Honda marine and automotive engines. This small yet essential rubber seal maintains a watertight connection within the fuel injection pressure regulator system, preventing fuel leaks and ensuring the engine operates reliably. Designed to exact factory specifications, it integrates seamlessly with existing engine hardware to maintain optimal durability and performance.. Key Feat