Product Information Material: Aluminum Flange Size: 3" Length: 5-5/8" Select a Product Part NumberIncludesSeal 3000-SPFlapper return springsMetal-to-metal 3000-BBlack Buna 3000-SWhite silicone 3000-NMetal-to-metal 3000-SSPFlapper return springsWhite silicone 3000-BSPFlapper return springsBlack Buna