This halocarbon refrigerant dip tube 48" Polymar - CGA660 is compatible with the Refrigerant Liquid/Vapor Stack Valve CGA660 Dual Outlet Polymer with Kynar (PVDF) coating for excellent wear and abrasion resistance. Designed according to both European and U.S. standards. Chemical and Thermal Resistant. 48" Kynar Tube. 3/8" Inner Diameter. 1/2" Outer Diameter. Valve and Retainer Clip Sold Separately. Must be installed by a qualified cylinder technician due to torque specifications. Compressed gas cylinders and valves are dangerous. Please use caution.