Profile: Marshall Gas Controls specializes in manufacturing and assembly of LP gas regulators, hose assemblies, custom brass fittings and plumbing components. Our industry standard automatic changeover regulator provides easy changeover from empty to full gas cylinders. Our integral two stage regulators for RV's, Type I ACME pigtails features a wrenchless green nylon nut, water fills and water regulators. We provide LPG low and high pressure regulators, hoses, appliance fittings and adapters.