Marshall Excelsior ME418P Acme Extend A Flow Tee Fitting The ACME tee fitting allows towable RV or cottage owners the ability to connect two high pressure LP gas appliances to a single LP gas cylinder source 1 inch 20 male high pressure propane appliance connection port and (1) combination 1.32 inch Type I Male ACME (Female POL) connection port for powering camp stoves, lanterns and table top appliances directly from the fuel supply of the RV QCC1 x Retro-Q x 1 inch 20M