3/8in NPT Socket Head Pipe Plug 25/pkg Black

The 3/8in NPT Socket Head Pipe Plug 25/pkg Black from REDHORSE PERFORMANCE is an essential bulk fastening solution for custom fuel and fluid line systems in performance automotive builds. Whether you're assembling a high-flow fuel rail, designing a custom coolant loop, or capping off hydraulic lines on a modified engine bay, this 25-pack offers the convenient quantity serious fabricators and engine builders rely on. Socket head design allows flush installation against mounting surfaces, critical when space is limited in modern engine compartments or when aesthetics demand a clean, finished appearance.

Constructed from durable black-finished steel, this 3/8in NPT pipe plug meets standard National Pipe Thread specifications, ensuring reliable thread engagement and leak-free sealing on any compatible 3/8in NPT port. The socket head design eliminates protruding hex flanges, reducing snag points and allowing tighter routing of fuel lines, brake lines, or transmission cooler hoses in tight engine bay layouts. REDHORSE PERFORMANCE plugs are engineered to withstand the vibration, pressure cycling, and thermal stress inherent to modified engine environments, making them ideal for turbocharged, supercharged, and naturally aspirated performance applications.

Engine builders, fuel system integrators, and DIY fabricators benefit most from the economy of a 25-pack, reducing per-unit costs on larger custom projects while ensuring backup plugs for future modifications or repairs. Installation is straightforward—apply thread sealant or PTFE tape to the NPT male threads and torque into any 3/8in NPT female port using a standard socket wrench or hex key. Compatible with fuel, coolant, oil, and most hydraulic systems, these black plugs maintain a professional appearance and deliver the corrosion resistance and reliability expected from a trusted performance parts supplier.