Honeywell Heat insulating nipple R-518-12

This 1-inch NPT nipple is made of ULTEM and serves as thermal insulation for connections in gas and industrial equipment. It reduces heat transfer between connected components and possesses high mechanical strength. Its temperature resistance is above 1400. It has no regulating function; its sole purpose is thermal isolation.

Nipples of this type are selected by the appliance model and specific assembly position, not by a general rating. The thread standard, length, and internal bore must match the original part to ensure proper alignment and sealing. Before ordering, compare the old nipple's thread size and overall form, and inspect mating surfaces for heat damage. Use an appropriate sealing method and apply torque within the manufacturer's recommendations to avoid cracking the insulating material.

Over time, the insulation material may degrade from repeated heat cycling, leading to cracks or loss of thermal isolation. This can cause hot spots on nearby components and abnormal stress on the connection. Check the nipple for signs of heat damage, deformation, or brittleness, and inspect mating surfaces for discoloration or distortion.