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Updated 06/30/2018 12:27 AM


Our custom designed tanks truly fit MCI's Luggage Bays more accurately than any other holding tank out there.
Custom built to fit MCI buses

However, lately these custom tanks have become a lot more expensive. So after exhaustive research, we've found some
standard water-chemical tanks built of the same material.
We found these to be just as good and cost half as much.
Below you will see a selection of these standard size tanks

Standard tanks sizes:

150 gallon fresh water
  60 gallon gray water
  40 gallon black water

Custom built Tank sizes:

Custom tanks:
180 gallon fresh water
80 gallon gray water
60 gallon black water

More on Holding Tanks and Pumps

Also, don't forget to see our BUS RV PARTS  page for more information on Plumbing  and Holding Tanks

See More tanks and Information !!!



Water Pumps/Expansion Tanks


One of the most critical parts of your plumbing system is the water pump. You want to make sure that you have a good reliable water pump/expansion tank/manifold system combination. We recommend using two Shurflo, Flojet, Jabsco, or equivalent pumps. The purpose of two is to assure plenty of pressure to meet your demand needs. The expansion tank and manifold prevents pressure drops when someone is running a shower and someone else flushes a toilet. 

No More expansion tanks needed..

Parts # 5900-0211
Seamless Shell w/ Electro-Coating. Variable Speed. Multi-Fixture Pump w/ Amp & Current Limiter
  • High Flow- 5.7 GPM [21.6 LPM]
  • Variable Speed Pump Controlled by Smart Sensor (trade mark sensor)
  • High Pressure @ 65 PSI [4.5 BAR]
  • No Pressure Switch Needed
  • Silent operation at any Flow/Pressure Condition
  • No Rapid Cycling
  • Seamless Heat Electro-Coated Motor Shell
  • 5 Chamber Design
  • Large Inlet and outlet Valve Passages
  • Automatic Voltage Protection
  • Current Limiting at 10 Amps Max.
Voltage: 12 VDC
9.25 x 5.0 x 4.72
[235mm] x [127] x [121]
Flow Rate: 5.7 GPM [21.6 LPM]
Amps (Max): 10
Shut-Off Pressure: 65 PSI [4.5 BAR]

 Sure flow has introduced a new computerized Pump .. Outs out more power and also keeps up with
your demand . The pump runs slow for slow demand then runs very fast for more demand .
So no more on off - on off constant cycling. 

Holding tank leaks ...
Spin-On vs. Glued or Screwed-In Fittings

Our Spin on type
Holding Tank Fittings,

The fitting is spun until it melts together with the tank.
Then we glue to the ABS/PVC drain pipes

Bulk head screw type fittings seem to not seal on the inside of the tank as good as it should
Be aware of the difference ..
Polyethylene and Polystyrene Plastics are difficult to Glue
or to Clamp to..
Remember,...You don't want your Black Water to leak.


Under Sink, Anti  Siphon Vent

Replaces vents cut through the roof ..

Pro Vent.
Manufactured housing and RV's only; automatic anti-siphon trap vent used as secondary venting. Simply hand tighten, no thread seal needed. Must be installed in accessible location with free flow air; do not install in sealed wall cavity. 1-1/2" MPT threads.
If home depot doesn't have it any
Mobile home supply depot will have it ..
This system only works if you have plastic hose already vented through the bottom of your bus pointing rearward to create a siphon under the bus floor..


This is a subject not talked about in a great deal. The RV industry has come a long way from the small cold plastic toilet to the new modern full sized china toilet. The biggest difference is that these toilets are extremely efficient with flush water. There are several companies now making these fine china toilets, such as Sealand, Jabsco, and Microphor.

Why China is Better than Plastic

Because of its vitreous (glass-like) surface, china fixtures resist staining and keep their luster. Plastic stains more easily, and the stains often cannot be removed.




China can be cleaned with abrasives without getting scratched. Plastic will scratch with abrasive cleansers, causing it to look worn and old.



Neo-Angle Showers


Over the years we've found that Neo-Angle showers are the most efficient use of tight space.

Plumbing System

Over the years, technology has advanced in everything, including simple plumbing. The latest advance in technology is using flexible plumbing lines without elbows that can freeze and not to have any types of connections in your walls. High end homes nowadays are built with a manifold system in the basement, where your hot and cold water come to a distribution box, similar to an electrical circuit breaker. From this manifold system, each line is flexible similar to a garden hose. The piping goes from the manifold to the fixture without any elbows or other connections. Below are images of a manifold and an example of a Hydronic heating floor system that's also available in our bus conversions.

PEX manifold.jpg (10253 bytes)

Manibloc Manifold System

Manifold System

Copper Manifold

Hydronic Floor Heating


PEX is an acronym for cross-linked polyethylene. The "PE" refers to the raw material used to make PEX (Polyethylene), and the "X" refers to the cross-linking of the polyethylene across its molecular chains. The molecular chains are linked into a three-dimensional network that makes PEX remarkably durable within a wide range of temperatures, pressures and chemicals.

There are several different methods used to cross-link polyethylene. It is important to distinguish between the various methods of cross-linking and the PEX products that result. A distinction should be made between PEX produced above the polyethylene crystalline melting temperature, and PEX produced below that temperature. Simply stated, there is a difference between PEX that is cross-linked during extrusion and PEX tubing that is cross-linked in a post-extrusion process.

Because of its -20F and extreme high heat acceptance, this is type of plumbing tubing we have found to be the best.                              

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