Anvil 319901005 Malleable Iron Threaded Cap 4 in

4 in Malleable Iron Threaded Cap

The Anvil 319901005 is a solid malleable iron cap designed to close a 4 in nominal pipe size line. It carries a Class 150 rating and is finished with galvanization for corrosion resistance. The fitting is intended for plumbing professionals and maintenance crews who need a dependable end-of-line seal. Buyers who require a plug with an integrated gasket or a different material should look elsewhere.

Galvanized Class 150 Female NPT Connection

The cap features a female NPT thread that engages standard male pipe threads without adapters. Galvanized malleable iron provides mechanical strength and surface protection in water, air and inert gas systems. No pre-applied thread sealant or separate seal is included, so the installer must supply compatible sealing compound or tape. The solid plug construction means there is no internal cavity to trap debris.

Pressure and Temperature Limits for Daily Service

The fitting is rated for 300 psi at 150 °F maximum operating pressure and 150 psi at 350 °F maximum steam pressure. Its service range extends from -20 °F to 350 °F, covering typical heating and chilled water loops. Because the cap has no moving parts, it adds no noise or vibration to the system and draws no power. Installers should verify that system design pressures stay within these published limits.