When did Sundown Audio change from rubber gasket to metal ring Metal Ring Gasket
Style 377R (oval) and 388R (octagonal) are rubber coated ring gaskets used in pressure testing to minimize damage to flanges. These gaskets, which are usually Metal Gaskets, Shims and Ring Joints Manufactured | Dobson Gaskets 24 150# 1/8 316 Stainless Steel Corrugated Metal Ring Gasket ...