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Old 05-02-2019, 01:16 PM   #1
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Fresh/Gray Tanks

I bought 3 tanks, the seller made a point of telling me they only had fresh and not gray. I now see a concern with the fresh tank. It has only one larger fill hole and 3 1/2" "drain" holes. On the gray I would need 2 larger holes for fill and drain. Anyone have a fix for this issue that doesn't require replacing a tank.
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Old 05-02-2019, 01:21 PM   #2
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Cut a hole where you want it to feed, tap some threads in in it or some 3M 5200 to a piece of pipe
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Old 05-02-2019, 01:28 PM   #3
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So, if I understand correctly, you have a tank designed for fresh water but want to use it to carry gray water.

Well... you could fix the problem at the source by using a screen to prevent large particles getting into the tank. Something like a sediment filter used in irrigation systems, maybe?

Those water tanks are usually made of polyethylene. I'm not sure there are any adhesives that really bond well with PE; that's why the fittings are usually spin-welded in place. A spin welder is basically a router (yes, a wood router) with a jaw for holding the fitting. You might be able to find a shop nearby which has a spin welder.. but I wouldn't hold my breath.

How about a bulkhead fitting? I arbitrarily clicked on Amazon at a 2" bulkhead fitting for US$8 and a 3" bulkhead fitting for US$31.
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Old 05-02-2019, 02:07 PM   #4
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Originally Posted by family wagon View Post
So, if I understand correctly, you have a tank designed for fresh water but want to use it to carry gray water.

Well... you could fix the problem at the source by using a screen to prevent large particles getting into the tank. Something like a sediment filter used in irrigation systems, maybe?

Those water tanks are usually made of polyethylene. I'm not sure there are any adhesives that really bond well with PE; that's why the fittings are usually spin-welded in place. A spin welder is basically a router (yes, a wood router) with a jaw for holding the fitting. You might be able to find a shop nearby which has a spin welder.. but I wouldn't hold my breath.

How about a bulkhead fitting? I arbitrarily clicked on Amazon at a 2" bulkhead fitting for US$8 and a 3" bulkhead fitting for US$31.
Can you tell me how you would get the big nut through the 2" hole"?
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Old 05-02-2019, 03:10 PM   #5
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Can you tell me how you would get the big nut through the 2" hole"?
OK, I was so busy being a smart aleck with the strainer suggestion that I didn't think through how to get a bulkhead nut into the tank very well (at all). But now that you've called me out on that..

Waste tanks often use a rubber grommet for the inlet fitting. The drain pipe presses directly into the grommet, ie there's no threaded connection. If the bulkhead fitting is needed only for the outlet, what about choosing a grommet for the inlet that fits a hole that's big enough to pass that inner nut through? Maybe that'll require a larger pipe than you want/need for the drain leading to the tank, but it could be sized down with a bushing or a reducer.
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Old 05-02-2019, 03:19 PM   #6
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OK, I was so busy being a smart aleck with the strainer suggestion that I didn't think through how to get a bulkhead nut into the tank very well (at all). But now that you've called me out on that..

Waste tanks often use a rubber grommet for the inlet fitting. The drain pipe presses directly into the grommet, ie there's no threaded connection. If the bulkhead fitting is needed only for the outlet, what about choosing a grommet for the inlet that fits a hole that's big enough to pass that inner nut through? Maybe that'll require a larger pipe than you want/need for the drain leading to the tank, but it could be sized down with a bushing or a reducer.
With the water tank gravity fed with no pressure, I would have no problem tapping a hole in the top (side) of the tank and threading in a fitting for a 3/4" hose. I purposely got a gravity feed receptacle for the outside and not a screw on hose fitting that can pressurize and burst the tank if you don't pay attention. Always have a relief valve on the tank.
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Old 05-02-2019, 03:22 PM   #7
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I have used something called a Uniseal found on ebay for my aquaponic system tapping into 55 gallon plastic barrels and ibc totes. works great.

I will probably do the same for my grey tank.

Drill appropriate hole, place seal, then push in pvc.
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Old 05-02-2019, 03:33 PM   #8
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With the water tank gravity fed with no pressure, I would have no problem tapping a hole in the top (side) of the tank and threading in a fitting for a 3/4" hose. I purposely got a gravity feed receptacle for the outside and not a screw on hose fitting that can pressurize and burst the tank if you don't pay attention. Always have a relief valve on the tank.
Yeah, there are several ways to crack that nut. For my own fresh tank I didn't want to have the traditional filler neck; I preferred to fill it by opening a valve while the pressurized "city water" is connected. An air vent is needed in any case. The regular filler neck in your approach provides that; for mine I have an extra threaded port at the top of the tank to serve as both vent and overflow.

But I thought we were talking about how to make one of your fresh tanks serve for gray holding. Maybe what you were getting at is that the gravity feed receptacle will be re-purposed as the inlet on the tank that gets used for the gray water? In that case, if there's no larger hole yet to be cut in the tank, maybe the bulkhead fitting won't work out.
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Old 05-02-2019, 03:35 PM   #9
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Originally Posted by MambaJack View Post
I have used something called a Uniseal found on ebay for my aquaponic system tapping into 55 gallon plastic barrels and ibc totes. works great.

I will probably do the same for my grey tank.

Drill appropriate hole, place seal, then push in pvc.
That looks like a decent option.
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Old 05-02-2019, 03:43 PM   #10
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Yeah, there are several ways to crack that nut. For my own fresh tank I didn't want to have the traditional filler neck; I preferred to fill it by opening a valve while the pressurized "city water" is connected. An air vent is needed in any case. The regular filler neck in your approach provides that; for mine I have an extra threaded port at the top of the tank to serve as both vent and overflow.

But I thought we were talking about how to make one of your fresh tanks serve for gray holding. Maybe what you were getting at is that the gravity feed receptacle will be re-purposed as the inlet on the tank that gets used for the gray water? In that case, if there's no larger hole yet to be cut in the tank, maybe the bulkhead fitting won't work out.
If you look at my tank pictured below, you will see 3 small access holes and one large hole. I assumed the large hole would be my drain and that I would need something larger for a drain into the tank. A bulkhead fitting only works when you can access both sides. I will use one for the smaller access ports for a breather overflow. I keep getting water supply into this tank on my mind, but it's a waste tank, not a fresh fill tank. So I need one bushing the size of the drain pipe going into the tank, probably 1-1/4" which I will step down from the 1-1/2" Hepvo trap. I think I'm good now. Thanks for input everyone.


I don't know why I keep talking about my fill valve and vent/ overflow, those go to fresh not to gray you dumb arse.
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