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Old 17-04-2021, 13:27   #1
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Reducing waste water plumbing.

I am refitting our head. I replaced the Thru-hull for both the intake and out. I ran into this problem though.

The barb fitting for the Marelon thru-hull I installed has an 1-1/8in barb fitting and the simple Jabsco pump head I want to use has an 1.5in fitting. Trying to pair this down has been a nightmare and I refuse to go back into Ace Hardware again.

Ultimately I need to know if anyone has ever fixed this and where did you get the parts that does not involve to many reducers and elbows.

Thanks ahead Grant
SV Toki
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Old 17-04-2021, 15:02   #2
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Re: Reducing waste water plumbing.

Rusty,

Can you not change the fitting on the thru-hull to 1 1/2”?

Capt Clark
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Old 17-04-2021, 15:25   #3
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Re: Reducing waste water plumbing.

Capt Clark,

The Marelon Thru hulls are 1.5 in. The problem is that the Hose barb (inside connection) taper down to a 1.125 in. I didn't even think about this as I was replacing all of the thru hulls. I got it back in the water ASAP and was going to replace the heads back in the Marina. then TADA.

https://www.go2marine.com/thru-hull-...relon-seacocks

Now this description clearly says that the Hose Barbs are 1.25in. Nope.. and I replaced both heads discharge thru-hulls with them. SO I have to make it work.

I've found this through ForeSpar , but still not sure how they will help me.

https://www.forespar.com/pdf/techTip...bing-chart.pdf

Rusty
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Old 17-04-2021, 16:33   #4
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Re: Reducing waste water plumbing.

Here go. Bottom of the list. 1 1/2 od barb to 1 1/4 od barb.

https://www.thepondguy.com/product/r...BoCAuAQAvD_BwE
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Old 17-04-2021, 23:24   #5
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Re: Reducing waste water plumbing.

Looks as though the problem has been sorted out for you.

One thing I've learned is how to replace hoses on my Perkins Marine engine. Perkins never built a marine engine but jobbers would buy bear Perkins 4 108 engines and marinise them and sell them as a "Perkins 4 108 Marine Diesel".

When I had to find hoses the Perkins mechanic said to go along to an automotive outlet and have a look at their rack of hoses, go through them with a vernier until yo get them with the right bends and right diameter. "Sometimes you might have to cut 6 inches out of a 2 foot hose". And that is what I did.
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Old 17-04-2021, 23:31   #6
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Re: Reducing waste water plumbing.

I have learned the hard way never to reduce the size of the waste hose as you go downstream.
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Old 17-04-2021, 23:42   #7
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Re: Reducing waste water plumbing.

Are you sure the seacock is 1.5". They do or did make a 1.125" also. If so, close the seacock. remove the tailpiece and replace it with the proper one.

As long as you do not turn the seacock on the thru hull you are fine.
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Old 19-04-2021, 14:58   #8
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Re: Reducing waste water plumbing.

Quote:
Originally Posted by stormalong View Post
Are you sure the seacock is 1.5". They do or did make a 1.125" also. If so, close the seacock. remove the tailpiece and replace it with the proper one.

As long as you do not turn the seacock on the thru hull you are fine.
Where did you find the replacement?
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Old 19-04-2021, 16:11   #9
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Re: Reducing waste water plumbing.

Quote:
Originally Posted by RustySlayton View Post
Where did you find the replacement?
The tail pieces are sold separately. When you buy Marelon each piece is sold separately. Any good marine supply that deals in Marelon should carry what you want.
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