Cross fitting has four male JIC 37° ends that accept standard 5/16" O.D. flared tubing. JIC-standard 37° fittings accept our standard 5/16" O.D. tubing (cut off straight, deburred, and flared) as well as Fixture Hose and Heavy-Duty Hose with 37°-flare swivel nuts. When using tubing, a Tube End fitting (CLR-400-F), consisting of a nut and sleeve, must be placed on each tube end before flaring is completed.