The Camco Clear RV Sewer Cap with Lanyard helps prevent leaks and spills from your RV's sewer system. It's compatible with 3" RV waste valves and is clear to allow you to see what's behind the cap, so you anticipate what's there. A bayonet fitting creates a secure connection with four points of attachment. Made of heavy-duty plastic with UV inhibitors for years of use. Includes a lanyard to help prevent loss.• Helps prevent leaks and spills from your RV's sewer system• Clear cap allows you to see what's behind the cap• Compatible with 3" RV waste valves• Bayonet fitting creates a secure connection with four points of attachment• Made of heavy-duty plastic with UV inhibitors• Lanyard helps prevent loss Clear cap to see what's behind it Bayonet fitting creates a secure connection Includes a lanyard to help prevent loss