This 3/4" x 3/4" MNTP Adapter is used with 3/4" Fastpipe solid aluminum tubing for easy connection in your airpipe system. Rapid Air products provide superior air quality. Not only do they cool hot compressed air quickly for better filter performance, there is also no corrosion in the pipe and fittings, meaning longer tool life. The O ring seals ensure a leak free system with no gluing, threading or soldering. MNPT Adapters allow you to expand or modify the system with ease