The female side of the Teleflex fittings at the helm & cylinder are 3/8th compression as stated above, whether you use there high pressure tubing or premade hose. Hose #'s are HO51xx for the standard and HO57 for the Pro version XX being the length. The hose ends are designed with an o-ring seal to couple up with the 3/8 comp fitting & stand alone fittings are nonexistent to buy separately as Teleflex has rights to the design. If you use the high pressure Teleflex tubing you would use a standard compression ring fitting preferably with an insert. Either way the female side is the same with either hose or tubing. Hope that helps clear things up.