Pipe Nipple, Cold Weld, Pipe Size 4 In., Connection FNPT, Length 10 In., Schedule 40, Material of Construction Galvanized Steel, 4.026 Inside Dia. (In.), 4.500 Outside Dia. (In.), 0.237 Wall Thickness (In.), Compliance Certified for Use In Potable Water Applications, Standards ASTM A733, ASTM A53