This coupler accommodates larger and smaller piping tubes, which permits the user to interchange standard tubes. Fits the following Jem Nozzles with small adaptor: 2B,2D,2F,113,115,116,121,123,172 Fits the following Jem Nozzles with large adaptor: 1B,1E,1F,1G,1J,2M,2R,2ES,250,252,2010
