Hy Coyote, Weatherhead makes their p/n 38097-1800 which is an 18" long [that is the shortest one listed] 3/8" i.d. line designed for connecting brake chambers to relay or quick release valves. The hose itself is catalog number H33806 that hose is 3/8" i.d. and 3/4" o.d., fittings that you can use to make up your line are Weatherhead 338'B' series, see if anyone in your area can find you either of those.
