I have a 78 H30 that came my way with a self contained all plastic head w/integral holding tank (3gal). The pump finally gave out and I want to replace this unit with a standard manual head and holding tank. The original head was plumbed to a 1 1/2" thru hull for discharge, with a tee connection to a pump out fitting on deck. There is no inlet thru hull. I do have a 1 1/2" thru hull for the lavatory drain that is below the waterline. Could I use this thru hull for intake and then plumb the lavatory drain into the head, thus eliminating the need for another hole in my boat?
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Head intake is 3/4"
That's what MOST sink drains are, too. Are you sure you measured it correctly? You can use the same through-hull, however instead of teeing the head into the sink drain, do it the other way round--tee the head sink drain into the head intake. Not only will you save another hole in the boat, but it'll give you another benefit: a way to flush the seawater out of the system...read the article "Intake Odor Cure" in the HM forum reference library. I suggest you also read other articles there before starting this project.
That's what MOST sink drains are, too. Are you sure you measured it correctly? You can use the same through-hull, however instead of teeing the head into the sink drain, do it the other way round--tee the head sink drain into the head intake. Not only will you save another hole in the boat, but it'll give you another benefit: a way to flush the seawater out of the system...read the article "Intake Odor Cure" in the HM forum reference library. I suggest you also read other articles there before starting this project.
The lav drain hose is 1 1/2", but I admit to not REALLY looking at the thru hull size. If the thru hull is 1 1/2", can I reduce down to 3/4" to match the intake size on the head, and will it still suck water? Great advice re lav drain to intake. I was planning on connecting the lav drain to the discharge side heading to the holding tank.
Are you measuring ID or OD?
Nominal hose measurements are always ID--inner diameter. Due to wide variations in the wall thicknesses of different kinds of hose, the OD--outer diameter--can be up to twice the ID. So hose sizes are always stated as the inner diameter measurement and fittings sizes--what hoses have to fit over--are always the outer diameter measurement.
Nominal hose measurements are always ID--inner diameter. Due to wide variations in the wall thicknesses of different kinds of hose, the OD--outer diameter--can be up to twice the ID. So hose sizes are always stated as the inner diameter measurement and fittings sizes--what hoses have to fit over--are always the outer diameter measurement.
Hose i.d.
Actually, the old discharge hose that I removed from the old head, and the lav drain hose are the same o.d. and the discharge hose i.d. is 1 1/2". I have not removed the lav drain hose, but will do that this weekend. Assuming it is 1 1/2" i.d., can I reduce down to 3/4" above the ball valve and make it work as an intake?
Actually, the old discharge hose that I removed from the old head, and the lav drain hose are the same o.d. and the discharge hose i.d. is 1 1/2". I have not removed the lav drain hose, but will do that this weekend. Assuming it is 1 1/2" i.d., can I reduce down to 3/4" above the ball valve and make it work as an intake?
Head discharge hose IS 1.5"...
So is tank discharge hose. Head INTAKE hose is 3/4" Those are IDs, not ODs. And yes, you can reduce if the thru-hull is really 1.5" If the sink drain really is 1.5" ID, tee it into the head intake hose below the reducer, so that it continues to be the same diameter all the way out.
So is tank discharge hose. Head INTAKE hose is 3/4" Those are IDs, not ODs. And yes, you can reduce if the thru-hull is really 1.5" If the sink drain really is 1.5" ID, tee it into the head intake hose below the reducer, so that it continues to be the same diameter all the way out.
Vented Loop
Thanks Peggy for the input. What about a vented loop? The original self contained had a 3/4" vent line exiting from the back of the unit. Is there a way to use this vent? The location of my new holding tank will be in a compartment under the vee berth, adjacent to the head compartment and next to the discharge thru hull. I assume that the discharge line needs to loop and vent somewhere between the head and the holding tank, but I'm cramped for space and not sure if I can get a loop up above the waterline from there. I've read all of your articles re installing a new head and am still scratching mine.
Thanks Peggy for the input. What about a vented loop? The original self contained had a 3/4" vent line exiting from the back of the unit. Is there a way to use this vent? The location of my new holding tank will be in a compartment under the vee berth, adjacent to the head compartment and next to the discharge thru hull. I assume that the discharge line needs to loop and vent somewhere between the head and the holding tank, but I'm cramped for space and not sure if I can get a loop up above the waterline from there. I've read all of your articles re installing a new head and am still scratching mine.
Hoo boy...
So many questions, so much typing.
A vented loop and a tank vent are two entirely different things that solve two entirely different problems. I'll make you deal: you read ALL the articles in the HM reference library, and search the archives and read everything I've written on installing heads and holding tanks...and if you STILL have questions, I'll answer 'em. In fact, if you'll e-mail me after you've read it all, I'll even give you my phone number.
So many questions, so much typing.
A vented loop and a tank vent are two entirely different things that solve two entirely different problems. I'll make you deal: you read ALL the articles in the HM reference library, and search the archives and read everything I've written on installing heads and holding tanks...and if you STILL have questions, I'll answer 'em. In fact, if you'll e-mail me after you've read it all, I'll even give you my phone number.I don't think so, Jim...
However, I'm always willing to learn. What make/model is your toilet? I'll look it up.
However, I'm always willing to learn. What make/model is your toilet? I'll look it up.
Vented Loops Galore!
Ok. If I follow all of your advice re archives on vented loops, I need one between the head pump and bowl (is there a place on most heads where I can interrupt the line?), between head discharge and holding tank and between manual pump and seacock. Plus a simple vent from holding tank to thru hull above waterline to discharge odors. Wow! This will be a challenging project.
Ok. If I follow all of your advice re archives on vented loops, I need one between the head pump and bowl (is there a place on most heads where I can interrupt the line?), between head discharge and holding tank and between manual pump and seacock. Plus a simple vent from holding tank to thru hull above waterline to discharge odors. Wow! This will be a challenging project.
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