Oil Inlet Fitting 12an x 3/8npt x 3.1in Steel

The Oil Inlet Fitting 12AN x 3/8NPT x 3.25in Steel from Peterson Fluid is a precision-engineered component designed for high-performance engine oil systems, particularly in custom builds, racing applications, and modified engine setups. This fitting serves as the critical junction point between external oil lines and engine block ports, making it essential for turbo kit installations, aftermarket cooler systems, and dry-sump conversions.

Built to withstand demanding conditions, this steel adapter is a must-have for enthusiasts who demand reliability in their oil delivery architecture. The 12AN hose barb end accepts -12 braided hose (common in turbo and cooler line setups), while the 3/8NPT threaded port adapts to standard engine block inlet ports found on most LS, small-block Chevy, and aftermarket block castings. Steel construction ensures durability under sustained pressure and thermal cycling—critical when routing hot oil through external components.

The 3.25-inch length provides adequate clearance in tight engine bay layouts while the compact 3.25 x 1.25-inch footprint minimizes interference with headers, intake manifolds, and accessories. Peterson Fluid's reputation for precision manufacturing means this fitting will not leak or fail under peak operating pressures common in turbocharged and supercharged applications. This oil inlet fitting is ideal for mechanics and engine builders installing turbocharger systems, oil coolers, or remote filter housings on street and race engines.