Camper Trailers Tech Tips

camper trailer water tank drain




water tank

protected from stone damage by steel guard

Most off road camper trailers that come with an underslung water tank do not have a drain facility to empty the tank. If you are not using your camper trailer for any length of time it is a good idea to empty the water from the tank to avoid bacterial growth.

I like browsing the shelves of various shops for ideas to potential camper trailer projects & came across a PVC 12mm T fitting with a tap at Jayco in Newcastle. This tap is used to switch between two water tanks to a common outlet & has a positive lock holding it in position. First thought was, could this be used as a drain for the water tank. 

Before putting this article together I wanted to make sure my idea worked, so after 10,000 kilometres over highway, dirt road & tracks it has not accidently turned on or dripped any water. As the saying goes it is a good idea not to put all your water in the one container. We always carry a couple of water jerry's.

First up I fitted a ninety degree 12mm screw-in PVC fitting onto the tank with a barbed fitting on the other end. This made the tap sit flush to the side of the tank & inside the edge of the tank's steel stoneguard. Do not use thread tape on the PVC fitting as it will flatten the thread of both the fitting & the PVC tank. You should be able to just screw the fitting in until it bottoms out & seals itself in the bottom of the hole. You can also wipe a little non acid grade silastic to the last few threads of the fitting to seal it.

I added a short length of food grade 12mm hosing & then the tap, both secured by hose clamps. The T runs to the handpump on the side of the camper.

For a quick walk around visual check I added white paint to indicate the flow of water. Pointing towards the outlet hosing goes to the handpump & when to the end it works as a drain.


90 degree fitting sitting flush with the side of tank white paint indicates water flow


article by Rob



september 2012