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Old 03-05-2018, 10:07 AM   #1
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Bilge Hose. Best Replacement?

Hi all,
I’ve recently noticed that two of our three bilge hoses are in sad shape. They are all similar to the other non-wire reinforced hoses elsewhere on the boat; rubber with a wrapping.

In our case the outer casing is getting spongy and coming apart in spots. At its worst you can see where the rubber is breaking down.

I suspect the two that are breaking down are original to our 1980 trawler.

Before I head over to Fisheries I wanted to see what others are using or recommend. Fisheries has many options.

Two 1.5” and one 2” (manual).

I’d like to replace everything and not worry about it for another 37 years.

Thanks in advance.
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Old 03-05-2018, 10:58 AM   #2
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Fisheries should have some good hose, just make sure it is a quality hose that is smooth bore, not the internally ribbed hose.
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Old 03-05-2018, 11:11 AM   #3
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The hose should also be pretty flexible so it doesn't stress the connection to the pump.
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Old 03-05-2018, 11:16 AM   #4
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Great tips, thanks.

Looking at options it seems like PVC (vs rubber) is the way to go for replacement given the nature of bilge water.
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Old 03-05-2018, 01:23 PM   #5
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I believe I used shields bilge hose on mine , although I wish I could find some cuffs to go over the corrugated ends to make clamping better .
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Old 03-05-2018, 02:08 PM   #6
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I believe I used shields bilge hose on mine , although I wish I could find some cuffs to go over the corrugated ends to make clamping better .
Doesn't it have a flat section every foot or so?
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Old 03-05-2018, 02:13 PM   #7
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Doesn't it have a flat section every foot or so?
Hmm maybe I didn’t use shields. Mine doesn’t have a flat section . That would definitely be a plus .
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Old 03-05-2018, 02:15 PM   #8
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I ended up using the white sanitation hose. Was easy to work with, crush proof and nothing to corrode. T

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Old 03-05-2018, 02:23 PM   #9
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Yep, Trident 148 looks like a winner and a 50' roll should cover both automatic pumps. The manual pump uses a larger hose so I'm sourcing that next.
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Old 03-06-2018, 11:11 AM   #10
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Good post as I have to replace my bilge hoses too. most of the hose I currently have is black almost wet exhaust hose. I believe it could be the original hose....yeks...
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Old 03-06-2018, 12:47 PM   #11
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I use plastic pipe on some of my bilge pumps. You can find sweeping 45° % 90° turns that don't restrict flow. Properly secured, it lasts near forever.
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Old 03-06-2018, 02:46 PM   #12
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Quote:
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Hmm maybe I didn’t use shields. Mine doesn’t have a flat section . That would definitely be a plus .
I think Attwood sells cuffs for corrugated hose (outside).... Last time I saw them was in a Home Depo in Marathon, Fl. I think pool hose has them in the pool section, but probably not small enough.

The thin white poly bilge pump hose has the flat sections every foot or so for cutting/clamping.

Some dont trust it....well thats a whole thread in its own.
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Old 03-07-2018, 11:57 AM   #13
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Found something interesting during this project. After contorting myself into the lazarette to make sure I understood the bilge hose thru hulls I found the high water bilge pump hose sharing the low water bilge pump thru hull. It had been plumbed in using a T fitting just before the thru hull. Oddly, the T is facing down.

This explains a strange thing I noticed when clearing a lot of water from the bilge (after adding a lot of water during cleaning/testing the pumps) where when the bilge water gets close to the low water pump shut off water seemed to rush down from the forward portion of the bilge. I thought that was sort of strange at the time but now realize that some of the water being pumped by the lower pump is coming back down the high water pump hose, spilling back into the bilge through the upper pump (when off).

This means some percentage of the water getting pumped out is coming back into the bilge due to plumbing goofiness. Not to mention when both pumps are on, they share a single 1" thru hull - which can't be good for both pumps to hit the expected GPH.

Scary.

The plan is to add a dedicated 1 1/8" thru hull for the high water pump (sans seacock) ensuring all three pumps (low, high, manual) have their own path to get bilge water overboard.

Finally, I'd welcome advice on a related note. Both existing thru hulls (1 1/8" for auto pumps, 1 1/2" for manual pump) are bronze seacocks (completely frozen open). Seems strange for bilge thru hulls and since they are basically inaccessible and clearly haven't been closed for years they seem like very expensive versions of themselves.

Any thoughts?
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Old 03-07-2018, 12:54 PM   #14
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How high are the seacocks above the waterline?

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Old 03-07-2018, 01:05 PM   #15
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About 3" - 4" above the boot stripe.
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Old 03-07-2018, 01:24 PM   #16
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I take that back - at the boot stripe.
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Old 03-07-2018, 01:30 PM   #17
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If the bilge pump hoses loop above the seacocks before going down to the pump, you're probably ok with them the way they are. If you cruise offshore, when the boat rolls, you may take on a shot of water if the hoses don't loop above the seacocks. All my hoses loop about 2' above the waterline before traveling down to the through hull fitting. If you have an inoperable pump and no loop above the seacock, it would be nice to be able to close it.

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Old 03-07-2018, 01:31 PM   #18
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I take that back - at the boot stripe.
I wouldn't be happy without the loop above the seacocks.

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Old 03-07-2018, 01:46 PM   #19
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Yeah, that's going to require cutting into the bulwarks. Seems like a mfg miss.
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Old 03-07-2018, 01:54 PM   #20
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Got a pic of each seacock?

Ted
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