Product Information Seal: Buna-N Select a Product Part NumberMaterialSize 400C-90-AL356T6 Aluminum4" 125C-90BRBrass1-1/4" 600C-90AL356T6 Aluminum6" 150C-90AL356T6 Aluminum1-1/2" 200C-90BRBrass2" 150C-90SS316 Stainless Steel1-1/2" 300C-90AL356T6 Aluminum3" 400C-90AL356T6 Aluminum4" 400C-90SS316 Stainless Steel4" 200C-90SS316 Stainless Steel2" 200C-90AL356T6 Aluminum2" 300C-90SS316 Stainless Steel3"