he main characteristics of SESTA fittings are: suitable for connecting multilayer pipes of the following dimensions: 16, 20, 26, 32, 40, 50, 63, 75brass alloy body CW617Ncoloured, non-removable plastic bushing holder,which prevents contact between the aluminium of the multilayer pipe and the brass of the fitting and thus ensures the absence of electrochemicalcoloured bushing holder acting as a guide for the pressing tong stainless steel sleeve with three holes for checking the correct insertion of the tube into the fitting o-ring certified EPDM and EN 682