The most compact low pressure regulator that meets ABYC marine standards, with gauge required for LPG system leak test. Screws directly into propane tank, 3/8" NPT female on low pressure side. 1/2lb. psi pressure. UL listed. Die-cast zinc. California Proposition 65 WARNINGBrass nozzles, quick connects, sprayer nozzles, hose fittings connectors, clamps, and couplings contain lead, a chemical that is known to the state of California to cause cancer, birth defects and other reproductive harm.