Medium pressure line fittings, couplings, tubing and nipples from High Pressure Equipment Co. are available with a 1 1/2-inch O.D. that can accommodate up to 15,000 psi. Fittings include elbows, tees and crosses as well as union couplings, bulkhead couplings and caps. Tubing and nipples are available in various lengths. 800/289-7447; www.highpressure.com.