Product Information Seal: Buna-N Male Thread: NPT Select a Product Part NumberMaterialMale Thread SizeCoupler Size 1510-B-SS316 Stainless Steel1" (25mm)1-1/2" (40mm) 3020-B-AL356T6 Aluminum2" (50mm)3" (75mm) 2015-B-AL356T6 Aluminum1-1/2" (40mm)2" (50mm) 2015-B-SS316 Stainless Steel1-1/2" (40mm)2" (50mm) 3040-B-AL356T6 Aluminum4" (100mm)3" (75mm) 2030-B-AL356T6 Aluminum3" (75mm)2" (50mm) 3020-B-SS316 Stainless Steel2" (50mm)3" (75mm) 4030-B-SS316 Stainless Steel3" (75mm)4" (100mm) 1510-B-AL356T6 Aluminum1" (25mm)1-1/2" (40mm) 4030-B-AL356T6 Aluminum3" (75mm)4" (100mm)