UL Listed, die cast body which is assembled with 300 psi leak test gauge, wall mount brackets (to save space in LPG locker) and 3/8” FPT outlet. 2 stages regulate changes in cylinder pressure to a constant pressure at stove, more efficiently than 1 stage. The BTU capacity of the 2 stage is 1/3 greater than the 1 stage regulator. Connect pigtail hose to regulator inlet and to one or more cylinders (one at a time). 100% leak tested – meets ABYC Marine LPG Standard.