At $60 to build and just over an hour, depending on skill, I hope you'll build one of your own. Please share your comments and suggestions for improvement. Thanks for viewing.
Step 1: Collect Supplies for Your Shower.
5' of 4" PVC pipe
1- 4" to 4" to 4" junction
2 - 4" caps
2- tubeless tire valve stems
1- ball valve
1- 3" pressure test cap
1- garden sprayer
1-6' garden hose
My favorite black paint
3/4" drill bit
Heat gun or torch
Step 2: Measure and Cut.
Step 3: Assemble Pieces for Fit.
It is probably important to mention here why I chose to use the 4" to 4" to 3" joint vs a 4" to 4" to 4" threaded. I found it very difficult to screw in the 4" cap and assure I had a good seal for pressuring up the tank with air. I felt the best option available was to insert a 3" pressure test cap for 3 reasons1) it's very easy to insert by hand and no tools are required 2) it provides an excellent seal and finally 3) it will blow out if pressures inside grow to great due to heat gas expansion. This provided a greatly needed safety, easy access for filling and an excellent seal.
The pressure cap is rated to 50lbs of head pressure, this equates to 21.666667psi. Therefore the cap will blow out with pressures near 21.66667psi. I would suggest not filling more than 15psi. If you intend to fully pressurize your showers tank you need to install a screw cap and properly calculate the max safe operationg pressure.
Step 4: Glue Your Shower Tank Together.
A quick tip from a fellow do it yourselfer tape your PVC glue and primer together, this will save you a load of time and frustration in he future when you need both.
Step 5: All Glued Up.
Step 6: Add Your Valve Stem.
Choose an appropriate drill for you valve stem and drill your hole.
I primed my valve stem hole and added a dollop of PVC glue to the stem for added seal.
Step 7: Install Your Ball Valve.
Drill your appropriately sized hole for your valve.
Then heat the hole with a heat gun or torch to assist threading your valve. I was very pleased with how well this method cut threads for the installation of the ball valve. My tank is water and air tight.
After threading in your valve allow your PVC to cool.
After your PVC and ball valve have cooled unthread you valve and add Teflon seal tape.
After thread taping reinstall your ball valve.
Step 8: Pressure Check.
4" PVC IS ONLY RATED TO 100psi. I have chosen not to exceed 15psi due to my use of the pressure test plug. Holds pressure well.
Step 9: Paint.
I love the finish of this truck bed liner spray paint and have found it very durable.
Step 10: Install.
Step 11: Fill With Water.
Step 12: Insert You Plug.
Step 13: Charge With Air.
If you have chosen to use a screw cap you may be able to use higher pressures. An additional tip is to pick up a small 12v tire inflator and pressure up your tank with it when you need to.
I also found if I remove the cap to eliminate suction the water flows perfectly well under the forces of gravity and a plus here is the slower rate conserves water. I found I could let water run for about 20min with sufficient flow for showering.
Step 14: Choose Your Shower Configuration.
I hope you build one of your own. If you have comments or suggestions for improvement please share.
Thank you for your vote if you're inclined to do so.