Marshall brass used to be a very good company for regulators, Extend-a-Stay and Extend-a-flow and other propane handling devices,, They have dropped that line completly.. I have no idea why and my contact within the firm is no more (She died back about 1993, Old age will do that to ya)
But they completly dropped that line, They now make things like Gas Fireplaces and such. Guess we did not buy enough to keep 'em happy.
Mr. Heater (I think) now sells the "Stay-a-while" which replaces the Extend-a-stay, virtually identical device.. But the old Marshall Brass standards.. no more.