Product Information Seal: Buna Select a Product Part NumberMaterialAdapter SizeCoupler Size G6040-DA-ALA380 Permanent Mold Aluminum4"6" G3040-DA-ALA380 Permanent Mold Aluminum4"3" G3020-DA-SS316 Investment Cast Stainless Steel2"3" G4030-DA-SS316 Investment Cast Stainless Steel3"4" G4030-DA-ALA380 Permanent Mold Aluminum3"4" G3020-DA-ALA380 Permanent Mold Aluminum2"3" G2030-DA-ALA380 Permanent Mold Aluminum3"2" G5040-DA-ALA380 Permanent Mold Aluminum4"5"