Armstrong A21348-1 Gasket

Armstrong A21348-1 Gasket is the official OEM cover gasket for Armstrong float-and-thermostatic (F&T) steam traps, specifically for B-2 and B-3 configurations in Armstrong HVAC equipment. This 1/2 in NPT gasket sits between the trap cover and body to seal the joint when the trap is reassembled, and it is rated for a maximum operating pressure of 15 psi and temperatures up to 353 °F, standard for many Armstrong B-series F&T traps. The part carries the Armstrong model number A21348-1 and is designed as a direct replacement within the Armstrong D1175-7 repair parts family, ensuring compatibility with the D1175-7 cover assemblies. Manufactured in the USA, it is a common maintenance part stocked by HVAC distributors for repairing B2/B3 F&T traps across multiple Armstrong lines. Common applications include use as the cover gasket for B-2 and B-3 float-and-thermostatic steam traps in commercial and industrial steam systems.