Camco Dual Vent Super Kit

Ready-to-use wastewater drain kiti; The complete kit has all the features you want for RVs with tandem holding tanks:
Includes: (2) Heavy Duty 10ft 18Mil HTS Vinyl Sewer Pipe with Swivel Bayonet and Pre-attached Snap Fittings, (1) Clear Elbow with 4-in-1 Adapter, (1) Translucent Swivel Y-Fitting and (4) storage plugs.
4 in 1 adapter: Compatible with 3 inch, 3-1 / 2 inch and 4 inch NPT threaded sewer fitting.
Translucent swivel Y-fitting: Allows two sewer pipes with snap connections to be connected to the same dump station - perfect for RVs with two separate holding tank valves. Fittings rotate 360 degrees for easy connection.
Easy to store: Hose and fittings retract for storage. With the 4-in-1 adapter removed, the sewer pipe assemblies fit into 4-inch square bumpers.