Product Information Seal: Buna-N Select a Product Part NumberMaterialSize 200DA-45AL356T6 Aluminum2" 300DA-45SS316 Stainless Steel3" 300DA-45AL356T6 Aluminum3" 400DA-45SS316 Stainless Steel4" 400DA-45AL356T6 Aluminum4" 600DA-45AL356T6 Aluminum6" 200DA-45SS316 Stainless Steel2"