PG 3/8-5/16 is kind of union straight reducer push in fittings with a 3/8" O.D tube and a reduced size 5/16" O.D tube, used to connect tubing of different sizes.
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PG 3/8-5/16 is kind of union straight reducer push in fittings with a 3/8" O.D tube and a reduced size 5/16" O.D tube, used to connect tubing of different sizes.