Product Information Seal: Buna-N Female Thread: NPT Select a Product Part NumberMaterialFemale Thread SizeCoupler Size 1510-D-AL356T6 Aluminum1" (25mm)1-1/2" (40mm) 3020-D-AL356T6 Aluminum2" (50mm)3" (75mm) 2015-D-AL356T6 Aluminum1-1/2" (40mm)2" (50mm) 3020-D-SS316 Stainless Steel2" (50mm)3" (75mm) 4030-D-BRBrass3" (75mm)4" (100mm) 1510-D-SS316 Stainless Steel1" (25mm)1-1/2" (40mm) 2015-D-SS316 Stainless Steel1-1/2" (40mm)2" (50mm) 6040-D-AL356T6 Aluminum4" (100mm)6" (150mm) 5040-D-AL356T6 Aluminum4" (100mm)5" (125mm) 4030-D-AL356T6 Aluminum3" (75mm)4" (100mm) 4030-D-SS316 Stainless Steel3" (75mm)4" (100mm)