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Union Coupling, Stainless Steel SS316 Material, 5/8'OD (15.88MM OD), Double Ferrule Fitting: Industrial & Scientific. Union Coupling, Stainless Steel SS316 Material, 5/8"OD (15.88MM OD), Double Ferrule Fitting: Industrial & Scientific. Twin ferrule fitting for high pressure application 。 Straight design for assembly tube in straight direction 。 Made of Stainless Steel 316 material for better corrosion resistance 。 Compression end connection at both ends 。 Twin ferrule fitting for assembly with tubing 。 The AU0-SSA is a stainless steel union coupling twin ferrule compression fitting. Union coupling is a straight type fitting that connects between tubes to form a straight line. It come with both end compression type connection. It can be assembly by tighten the nut, front ferrule and back ferrule on tubing to the fitting body.。The working pressure is depend on the tube OD and thickness. The higher tubing outer diameter, the lower working pressure it can withstand. The thicker the thickness, the higher working pressure it can withstand.。Below is standard installation instruction for double ferrule fitting:Insert the tubing the fitting until it bottoms the fitting shoulder and hand-tighten the nut。The nut need to be tighten until the tubing does not move axially nor turn by hand。Mark the nut at 2 o'clock position and wrench-tighten the nut /4 turn to the 3 o'clock position while holding the fitting body with a second wrench.。For fittings size that smaller than /4"OD or 6MM OD, the nut need to be tighten 3/4" turn to 9 o'clock position.。 。 。 。