Product Information Male Thread: NPT Select a Product Part NumberMaterialMale Thread SizeAdapter Size 3015-F-SS316 Stainless Steel1-1/2" (40mm)3" (75mm) 4030-F-SS316 Stainless Steel3" (75mm)4" (100mm) 3020-F-SS316 Stainless Steel2" (50mm)3" (75mm) 4030-F-AL356T6 Aluminum3" (75mm)4" (100mm) 3040-F-AL356T6 Aluminum4" (100mm)3" (75mm) 2015-F-AL356T6 Aluminum1-1/2" (40mm)2" (50mm) 3015-F-AL356T6 Aluminum1-1/2" (40mm)3" (75mm) 1520-F-AL356T6 Aluminum2" (50mm)1-1/2" (40mm) 3020-F-AL356T6 Aluminum2" (50mm)3" (75mm) 2015-F-SS316 Stainless Steel1-1/2" (40mm)2" (50mm) 2030-F-AL356T6 Aluminum3" (75mm)2" (50mm)