Dump Line

Installation of the dump line

Annual cleaning of the fresh water tank, winterizing or storage is made possible by a short dump line to the exterior and below the vehicle.


Some of the accessories are also used in other parts of this water tank project and other projects of this build. It may be wise and cost effective to figure out in advance, how many of each you need for the entire build; you can also have a look at a Comprehensive Material List for most of the parts of this Fresh Water Tank Project.

Which Parts To Choose

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Comprehensive Material List

If you consider to build the entire Fresh Water Tank base unit and need most or all materials, click the button to see a comprehensive buy list for the entire project.


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Clear Vinyl Tubing

0.5″ ID hose
10 feet
Low Pressure Applications

Shut-off Valve

1/2″ Hose Barb Shut Off Valve with Clamps for Water. (2 pieces)

Hose Clamps

20pcs – Stainless Steel Adjustable Clamps. Fit 1/2″ 5/8″ 3/4″ Hose.

GE Silicone Caulk

2 Pack
10.1 Oz

Black Undercoating

20 oz


Hole Saw Kit

17-Piece Hole Saw Set, 3/4″ to 5″ Hole Saw with Mandrel for Wood, Plastic and PVC.

Dump Line Installation

Installation of the dump line.

1. If possible, inside the base unit, drill a 0.75” hole through the tank and further down, through the floor of the vehicle.

2. Connect a 0.5” barbed hose valve to a 0.5” hose and fasten with a hose clamp.

3. Preferable, attach the valve to the inside base unit wall and guide the hose end through the opening.

4. Fill the space between the hose and both floors with silicone caulk.

5. Optional: Spray some undercoating on the outside of the hose and below the vehicle floor.

6. Attach another piece of 0.5” hose to the other side of the valve; add a 0.5” Barb-to-NPT to the other end (this will be connected later to the dump opening at the bottom of the tank).


  • 0.5” hose
  • 0.5” barbed hose valve
  • hose clamp
  • silicone caulk
  • undercoating


  • drill
  • hole saw
  • screwdriver


The missing parts of the complete van conversion process are being added regularly to this Build Guide. If you want to suggest a specific build option for this guide, submit a content correction or have a general inquiry, send me an email.

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Disclaimer: Throughout this guide, all guidance, building techniques and other information are based on my own experiences of converting a cargo van into a Tiny House on wheels. This guide is only for informational purposes; always build according to local and national standards. Be aware that such a project is expensive, requires a substantial amount of broad knowledge of building techniques and involves more work hours than you can imagine. Besides of hitting a finger with a hammer, much more serious harm can be done when you work with 12V/120V electrical systems, propane installations, power tools, etc. Tapping into the vehicle’s own systems can also damage its functionality. Get professional help where needed; never take any risk!