Marshall Excelsior Propane Adapter Tee Model ME422P. The ME422P camping appliance fitting allows towable RV or cottage owners the ability to connect two high pressure LP gas appliances to a single LP gas cylinder source. The ME422P has a 1in 20 male high pressure propane appliance connection port and (1) combination 1-5/16in Type I, QCC Male ACME/CGA 510 (Female POL) connection port for powering camp stoves, lanterns and table top grills, portable heaters and other LP appliances directly from the fuel supply of the RV. QCC1 x Retro-Q x 1in 20M x 1/4in Inv. Flare, packaged.