Eddie, See below, 1.7.3; can be in either the high pressure side or the low pressure side, as long as it's at the supply source... 1.7 CYLINDERS, VALVES, AND SAFETY DEVICES 1.7.1 Cylinders used in LPG systems shall meet applicable DOT regulations or ASME requirements. 1.7.2 Each appliance shall be sen/ed by a separate low pressure, (i.e., 14 in water column [(5.5 kF‘a]), regulated supply line that shall originate inside the cylinder locker or protective enclosure. 1.7.3 A readily accessible manual or electrically operated (e.g., solenoid) shutoff valve shall be installed in the low or high-pressure line at the fuel supply (see A-1.7.6.1 for valve location requirements). 1.7.3.1 The valve(s) or its control shall be operable in the vicinity of the appliance(s) in the event of a fire at any appliance(s). lf the cylinder shutoff valve is readily accessible from the vicinity of the appliance, the shutoff valve on the supply line is not required. 1.7.3.1.1 The valve or its control shall be operable without reaching over the top of any open flame appliance (e.g., cooking appliance burners). 1.7.4 In addition to the valve required at the cylinder, a multiple cylinder system shall be provided with a shutoff valve, or automatic check valve, at the cylinder manifold so that each cylinder can be isolated from pressure feedback from other cylinders. 1.7.5 Pressure Regulators 1.7.5.1 Each LPG system shall be provided with a pressure regulator specifically designed for use with LPG. 1.7.5.2 The LPG pressure regulator shall deliver gas, under varying appliance loads, at a pressure not in excess of 14 in water column (3.5 kPa). 1.7.5.3 A low side pressure relief device shall be integral with each regulating system, and it shall discharge at between two and three times the delivery pressure of the regulator. 1.7.5.4 All relief valve outlets shall discharge into the dedicated locker or to the open atmosphere outside the boat. 1.7.5.5 A relief valve’s point of discharge shall be at least 20 in (508 mm) distant from any opening to a cabin or the hull interior. 1.7.6 Cylinder and Connected Devices - Location and Installation 1.7.6.1 LPG cylinders, cylinder valves, regulating equipment, and safety devices shall be readily accessible, secured for sea conditions, and protected from the weather and against mechanical damage. 1.7.6.1.1 The cylinder shall be installed in a dedicated locker meeting the requirements of A-1.8. EXCEPTION: LPG cylinders installed on the exterior of the boat where escaping gases will flow directly overboard. Jim Peg and Jim Healy aboard Sanctuary http://gilwellbear.wordpress.com <http://gilwellbear.wordpress.com/> Monk 36 Hull #132 MMSI #367042570 AGLCA #3767 MTOA #3436