RE400NO by Dixon Valve | Boss-Lock Cam & Groove Adapter | Type E | 4" Adapter x 4" Notched Hose Shank | 316 Stainless SteelFeatures: The largest advantage of the notched design is that the coupling can be removed from a damaged hose by cutting away the ferrule, without necessarily damaging the fitting. After inspection of the fitting to determine its suitability for reuse, it can be reinstalled into another hose by using a new ferrule. Safety Notes: Use with Notched Ferrules. Under no circumstances should cam and groove couplings be used for compressed air or steam