Coupling Fitting; Type Hex Nut; Size A 5/16 Inch; Size B 5/16 Inch; Material Brass; Material Specification ASTM F877; Gasket Supplied No; Application Radiant Heating and Cooling System, Snow and Ice Melting System, Permafrost Protection System, Turf Conditioning System; Applicable Standard NSF; Overall Dimension 1.83 Inch Length x 0.75 Inch Width