The best hardline fitting ever made, period. The patent-pending Optimus gasket design is exponentially stronger than any o-ring design ever made. Our 1/8" (3.2mm) thick gasket provides huge surface area to clamp the hard tubing. With ultra-precision machining, extreme corrosion resistant Pro-XE nickel, plasticizer-free o-rings and sup
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A little expensive, but u get what u pay for. Have all 18 of these fittings in my new build and they are of great quality. Typical G1/4 O-ring on the outside, but the seal on the inside of the fitting is extremely tight and well designed. Love these things.