primefit pckit26 air piping system, 26-piece air push to connect kit with 1/2-inch (od) / 3/8" (id) x 100-feet tpee tubing primefit the primefit 100-foot x 1/2-inch air piping system is perfect for any homeowner application with all the accessories needed to complete your ultimate garage. the system provides a convenient solution to ensuring your air connections are off the floor and creating a safer environment free of tripping or falling.