Question 1

The last picture asks if i need a different size do you do custom sizes? what i would like is the profile of the 21g, but shorter such that its only10

Accepted Answer

The 21 gallon tank measures roughly 9" x 17" x 43"
The 10 gallon tank measures roughly 10" x 15" x 21" 
With that being said the 21 and 10 are very similar in the length and width. The height is just scaled down but roughly 22" to reduce the overall volume. Thanks

Question 2

What sizes are the threaded connections?  It looks like theres 3 blue ones and one red one?  Are those the only openings?

Accepted Answer

3 of the ports (blue ones) are 3/8 threaded NPT female  Typically a threaded barb connector is screwed in to attach reinforced vinyl tubing with a hose clamp.

A blue blue one with the 1.25 size (red one) should be on the high side of the tank when mounted and the blue one is attached to a vent tubing.

The other two blue ones mounted at the bottom of that side. One has a tubing going to drain valve.  The other is typically vinyl tubing to the input side of a 12VDC RV water pump.

The large Red one)  is a 1.25 inch. No threads.  For use with a slip over flex tubing with a hose clamp for a gravity feed fill tube.  Ideally this red port should be on the high side when you mount the tank.

Question 3

If I’m using this as a gray water tank, how do I drain the water out of it? What equipment do I need for that?

Accepted Answer

The tank has many 1/2” threaded holes so you can mount it many ways. Use one of the 1/2” holes and add water line and off/on valve to it.  We use Pex waterline from Hdepot. Or you could use clearctubing

Question 4

What is everyone using to connect the large red nipple?  It’s not threaded. Are you just slipping a clear hose over it with a pipe clamp and hoping i?

Accepted Answer

Yes, hose and a pipe clamp

ASIN	B07QY8RX37
Best Sellers Rank	#70,142 in Automotive ( See Top 100 in Automotive ) #19 in RV Freshwater Tanks & Inlets
Brand Name	A.A
Capacity	16 Gallons
Color	White
Item Dimensions L x W x H	61L x 38.1W x 20.3H centimeters
Item Weight	1000 Grams
Manufacturer	Automotive Authority LLC
Manufacturer Part Number	FWT-RV
Material Type	Polyethylene (PE)
Number of Items	2
Number of Packs	2
Shape	Rectangular
UPC	605941831159
Unit Count	2.0 Count

Combo of Fresh Water Gray Water Holding Tank, RV and Caravan, BPA Free (16 and 21 Gallons)

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