NPT Socket Head Pipe Plug Kit -02 -04 -06 -08

The NPT Socket Head Pipe Plug Kit -02 -04 -06 -08 from REDHORSE PERFORMANCE is an essential component for any serious automotive builder managing fuel systems, coolant lines, or vacuum plumbing. These precision-engineered plugs seal off NPT (National Pipe Thread) ports that would otherwise leak pressurized fluids or create vacuum leaks in high-performance engine bays.

Whether you're running a modified fuel rail, custom coolant distribution block, or adapting OEM ports during an engine swap, this four-size kit eliminates the need for multiple purchases and ensures compatibility across your entire fuel or coolant system architecture. Each plug features a socket head cap design that allows you to install or remove fittings with a standard hex wrench, providing superior access in tight engine compartment layouts where space is at a premium.

The NPT thread standard—available in -02 (1/16"), -04 (1/8"), -06 (1/4"), and -08 (1/2") sizes—ensures universal compatibility with aftermarket fuel system components, aluminum manifolds, and custom-fabricated plumbing blocks. REDHORSE PERFORMANCE's reputation for leak-free performance comes from precise thread rolling and material selection that withstands both static pressure sealing and thermal cycling, critical when managing turbocharged fuel systems or high-flow coolant circuits running elevated temperatures.