Excela-Flo™ Low Capacity Compact 2 Stage Regulator (MEGR-295LP) by Marshall Excelsior. Hard-Nose Excess Flow POL Inlet x 3/8" FNPT Outlet - 90° Vent. Packaged option consists of a plastic clamshell with barcode. The MEGR-291L Series two-stage regulators are specifically intended for applications with low BTU demands but still require two stage regulation. The Model MEGR-291L is ideally suited for RV, manufactured homes, cabins or other applications with one appliance or low BTU multiple appliance applications while still permitting maximum range of output pressure adjustment.