Trident Marine Single Stage Tank Mount LPG Regulator with Gauge is the most compact low pressure regulator that meets ABYC marine standard with gauge for required LPG System Leak Test. It is fully assembled and leak tested with solid brass: male POL cylinder fitting, street tee & 300 psi gauge (low profile, water tight, stainless steel); and UL Listed die cast zinc body with 3/8 FPT outlet.