Drain potentially harmful gray waste water from your tank with a Camco RV Sewer Cap. Gray water is the leftover shower water that may pose a health hazard. This advanced Camco sewer cap has a hose connection to channel water away and bayonet-style tabs that securely lock to the RV drain and form a tight seal. This item easily installs in only minutes, so you can get out on the open road. Each sewer cap with hose connection measures 8.44"L x 5.63"W x 2.25"H.