These Valterra bayonets (or nubs) are required at the termination of your waste system to allow for connection of a modern Valterra standard cap or sewer hose ("stinky slinky"). It is incompatible with older Thetford style hoses and caps. If you are re-plumbing your dump valve area of your trailer, we highly recommend using this Valterra standard for all hose connections.
We have bayonets available in two styles: hub and spigot. Both are made of ABS and should be solvent welded onto your pipes.