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Silverback Extension hose adds 10 of length to your RV sewer hose. Designed for use with Silverback drain hoses. Swivel fittings rotate to eliminate twisting and keep hose laying flat. Bayonet fitting easily attaches to the standard 3" lug fitting on your RVs waste valve. Lug fitting hooks up to the bayonet fitting on your existing sewer hose. Internal seals helps prevent leaking. Extra-thick, 24-mil poly construction is strong and wont degrade in the sun. Springs back into shape when pressed or crushed. Flexible and easy to manuever, even in temperatures below freezing. 100-Mil protective beading resists scrapes and abrasion. Hose collapses for storage. Diameter: 3"