One of the first steps in the plumbing process is to situate the water tank and build the cabinet that houses it. I started by drilling out the ends to make way for all the connections, 1. pump intake, 2. drain, 3. fill hole, and 4. vent. See post above for hours of standing in the plumbing aisle at HD. I think it's a right of passage on these builds. Hopefully I can save you some time.
I bought my tank from classAcustoms. Their FAQ page actually has lots of info about hooking up their tanks or any other.
http://classacustoms.blogspot.com/2017/02/water-tank-information-class-customs.htmlThe fittings on my tank are 1/2" and 1-1/2". There are four fittings on one end of the tank, two of each size.
For the fill hose I ordered one of these 1.25" hoses from Amazon.
https://www.amazon.com/1-25-Flats-Concession-Fresh-Water/dp/B07B4MLWJJ. The 1.25" end slides snugly over the port I just installed in the side of the trailer. Add a hose clamp and that was easy.
On the tank side I needed a few adapters, so it starts with a 1.5" to 1.25" adapter, then a 1.25" to 1" adapter and then a nipple fitting (male on both sides) that is 1". This screws tightly into the hose and is pictured below.
Tank side connections for fill hose...
Don't forget to use some thread-sealant (different for plastic pipe and different than tape).
For the pump and vent connections I'm using plastic fittings that connect to the 1/2" ports in the tank and braided nylon hose.
Connector from tank to hose...
Don't forget to drill out the fill and drain ports on the tank before you install. The 1.5" connections are threaded, but are sealed at the back of the threads from the factory. The 1/2" holes come with little threaded inserts and are ready to go.
I'm still working on the pieces for the drain, but will add to the shopping list when that's completed.
BTW, if you see something here that is wrong or could be done WAAAY better please speak up. This is my first time dong this!
Shopping list if you want to replicate this setup...tank from classAcustoms
Fill
1.5" to 1.25" converter
1.25" to 1" converter
1" schedule 80 nipple piece (two male ends)
1.25" hose from amazon (see link above)
wall mount to fill port to mount in outside of trailer
https://www.amazon.com/Valterra-White-Gravity-Water-Trailer/dp/B0735PZW4HPVC thread sealant
Vent
1/2" threaded to hose barb
hose
2 hose clamps
Pump connection
1/2" threaded to hose barb
nylon reinforced 1/2" id hose
2 hose clamps