1.5in Hose Adapter With 1/4in NPT Port

The 1.5in Hose Adapter with 1/4in NPT Port by Cold Case Radiators is a precision-engineered coolant system component designed for custom cooling setups, engine swaps, and aftermarket radiator installations. As a mechanic who regularly handles high-performance builds, this adapter solves a critical compatibility challenge: bridging 1.5-inch hose connections to NPT (National Pipe Tapered) threaded ports found on gauges, heater control valves, bypass blocks, and auxiliary cooling accessories. Whether you're fabricating a fuel-cooled turbo setup, integrating auxiliary oil coolers, or plumbing a custom radiator configuration, this adapter eliminates the need for expensive custom fabrication or restrictive hose routing.

Constructed to Cold Case Radiators' tight manufacturing standards, the 1.5in Hose Adapter features a robust barbed or slip-fit connection on the hose side paired with a precision-tapered 1/4-inch NPT female port. The NPT thread form ensures a leak-free seal when paired with proper threadlocker or Teflon tape, accommodating both metric and imperial system integration common in LS, EJ, and K-series engine conversions. Its compact footprint—measuring just 2.25 x 2.05 x 3.05 inches and weighing only 0.25 lbs—minimizes clearance issues in tight engine bays, while the 1.5-inch bore maintains optimal coolant flow rates without restriction, critical for maintaining target coolant temperatures under sustained load.

This adapter is essential for fabricators, tuners, and weekend warriors building custom cooling systems where OEM manifolds or adapters won't fit the application. Install it between your radiator hose and cooling control devices, temperature senders, or auxiliary system ports using standard hose clamps on the barbed side and a wrench on the NPT port. Verify your hose I.D. matches 1.5 inches and confirm NPT thread compatibility with your destination component before assembly. Cold Case's quality ensures reliability in street, track, and show applications where cooling system integrity directly impacts engine longevity and performance.