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Old 03-21-2013
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Holding tank fittings - how much clearance?

Hi, does anyone know how much space I'll need above my tank for some 90 degree elbows? My holding tank will be in the bow under the berth and there won't be a lot of clearance above the tank where I want to put the fittings. The old tank was located in the bow as well, it was stainless steel and the fittings were all on the aft side of the tank .. and leaked. First thing I did when I purchased the boat was get rid of the whole arrangement from tank to head and now I'm finally replacing it all with new and would like to do it right.

I think I've read every thread on holding tanks on this forum and haven't found the answer to that question

Also, how does one install a pickup tube?

Thanks

edit: I've got a max of about 3.75" clearance above the tank.

Last edited by smp; 03-21-2013 at 11:46 AM.
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Old 03-21-2013
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Re: Holding tank fittings - how much clearance?

3.75" is tight, but will probably work. I'd have to measure.

The easiest way to do a pickup tube is using the kit from Sealand. It just requires a hole to be cut with a hole saw, and includes a special seal and all of the tubing to do the rest of it. This is the kit:
SeaLand 385310660 | Fisheries Supply

All but about 1/2" of that is inside the tank.

This type of elbow goes on top:
Marelon Elbows - Male - Forespar | Fisheries Supply

I think a 1.5" one sits about 2.5" high (including the Sealand fitting), but I'd have to measure on my boat.
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Re: Holding tank fittings - how much clearance?

Thanks!

Yeah, I have seen the sealand pickup tube but what I didn't understand was how to install it without an access port. The tank I'm ordering doesn't have one. So, let me make sure I understand:

3" hole, the sealand pickup tube threads into this and has a female threaded opening on top that in turn accepts the 1.5" elbow fitting?

Did I get that right?
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Re: Holding tank fittings - how much clearance?

There is no threading.

You drill a hole of the right size (could be 3", check the documentation). You insert a rubber bung into that hole. The dip tube and a threaded fitting then fit into the bung.

It's an easy setup.

If you have a local store that sells and modifies holding tanks then I'd buy from them and they can put all of the fittings exactly where you want them. I did this in Seattle at "Marine Sanitation" and it was the same price and more useful than buying a holding tank with fittings in some generic location. It also kept me from being stuck with a less than useful 5/8" vent.
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Re: Holding tank fittings - how much clearance?

Hmm .. so what keeps the 'bung' from coming out? I'm a little paranoid about fittings on holding tanks. The setup I'm replacing was a nightmare.
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Re: Holding tank fittings - how much clearance?

The bung is tapered and hooks the inside of the holding tank. It can't come out unless the hole is oversized or you first remove the plastic threaded fitting that goes inside the bung. That fitting is a very tight fit and holds everything in place.

It's a good system. I'm using two of them (one dipstick for pumpout, one for the macerator) and have no concerns. I trust it just as much (maybe even more) than the plastic welded fittings.
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Old 03-22-2013
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Re: Holding tank fittings - how much clearance?

I had the same problem and found some low clearance elbows here, Tight Elbow. They can thread strait to a proper 1.5 inch fitting welded to the tank, or used with a threaded fitting and uniseal (the soft gasket mentioned above).

I also found a low clearance tank monitor here, Home

I have no affiliation with either company.

The fittings look like this, the elbows are not yet installed,

http://www.sailnet.com/forums/attach...1&d=1363924760

I made the tank, yes the core is wood, but the interior is epoxy.
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Holding tank fittings - how much clearance?-dscn1940.jpg  

Last edited by baboon; 03-22-2013 at 12:05 AM.
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