3/8in Vac Fitting Push To Connect 1/8in NPT

The 3/8in Vac Fitting Push To Connect 1/8in NPT from REDHORSE PERFORMANCE is a precision vacuum line adapter engineered for custom engine builds, emissions systems, and aftermarket fuel management setups. Whether you're installing a turbo boost controller, custom brake booster lines, or PCV system modifications, this fitting bridges the gap between standard push-to-connect hose and NPT threaded ports commonly found on engine blocks, intake manifolds, and auxiliary components. Mechanics and enthusiasts rely on these adapters to maintain sealed connections without the leak-prone tape-wrap methods of the past.

This adapter features a 3/8-inch push-to-connect port on one end and a 1/8-inch NPT (National Pipe Thread) male connection on the other, allowing you to mate modern flexible vacuum hose to traditional threaded ports with zero guesswork. The push-to-connect design uses a collet-style grip that engages the tubing securely, while the NPT end threads directly into factory or aftermarket bosses without additional fittings or adapters in line. REDHORSE PERFORMANCE's design tolerances ensure a leak-free seal under full vacuum draw, critical for maintaining consistent boost levels, brake assist, and emissions control functionality in modified engines.

This fitting suits engine builders, turbocharger installers, and fuel system integrators working on LS, small-block, and custom applications where OEM vacuum distribution blocks are absent or incompatible. It's equally valuable for brake booster relocation, catch-can plumbing, and any scenario requiring a compact transition between flexible hose and hard-port vacuum connections. Compact at 2.8 x 1.1 x 3.8 inches and weighing just 0.07 pounds, it installs in tight engine bays without requiring special wrenches—hand-tight on the hose, standard wrench on the threaded port.