The size of the gas line is extremely important. If the line is too small, the gas flow in the manifold will be low. This inadequate flow will cause slow recovery and delayed ignition. If in doubt about the proper size of your service line, consult your local gas utility company. DO NOT connect appliance before testing the pressure of the gas service supply piping system. FOR NATURAL Toddler Bounce House For Sale GAS – Fixed orifices are set at 4” W.C. (water column). If a pressure regulator is supplied, it must be installed when the unit is connected to the gas supply. FOR PROPANE GAS – Fixed orifices are set at 10” W.C. (water column). If a pressure regulator is supplied, it must be installed when the unit is connected to the gas supply. Pressure regulator must be tested in a full condition (all valves “ON”). A condensation/paniculate trap must be provided in the supply line, with a separate shut-off valve upstream of the regulator. These items are customer installation responsibilites.