Thru Hull Fittings

[bmck25]

I am about to add a second bilge to my boat and need another thru hull fitting. My boat has black fittings on it now, but all I can find are white fittings.

I thought I had seen some chrome fittings on here awhile back.

Anyone know where I can get some better looking fittings than white, or at least a black fitting?

[21XDC]

I would just "Y" into the same fitting. Who wants more holes and fittings to look at? Look at the home centers 3/4 in plumbing/sprinkler fittings.

But if you insist>> http://www.candomarineparts.com/Thruhull.html

[VinceJE]

Regarding using a "Y" fitting... What prevents one line from pumping at least some of the water back down to the other?

I'm planning to add a second & automatic bilge pump and don't want to drill another thru-hull hole either, so I'm interested in different options.

[THERAKE]

If you need to add a bilge pump,I would think that the primary would be pumping at the same time so I would think that the water couldnt come back down the other hose being that they would both be pumping out.But that being said only so much water can go through one hole.

[VinceJE]

Yea... I just don't see how tying the two pump's output together can be done without problems. One pump running would feed water back into the bilge through the pump that's not running. Both pumps running to the same line has got to affect the combined throughput. I don;t like drilling holes in the hull, but that's what I'll be doing soon to install my backup pump.

[Lpolk]

Yea and you would need a check valve. IMO just more trouble than it's worth. Another hole would be the only option, that would work properly.

[Hoosier fisherman]

You are going to need two holes.

[TRCM]

I plan on adding a 2nd bilge pump on mine as well, but I plan on tying into the same hull fitting as the livewell pumpout uses with a check valve to keep me from filling the livewell with the bilge water and a check valve to keep me from filling the bilge with the livewell water.

I don't expect to need to pump out the livewell and bilge at the same time, and it gives me full flow from both bilge pumps.

I also will use the manual bilge pump to tie into the livewell pumpout, so that if in some case, the auto bilge kicks on while I am pumping the livewell, there is no problems.

[VinceJE]

I'm not lecturing here... just thinking out loud on the topic with my point of view....

Tying multiple pumps to the same output is alot of volume going thru one little hole. The only way to make that work effectively is to double the diameter of the fitting. I can understand not wanting to add holes to the side of the boat. Drilling on the boat makes me cringe too. I did some research and found that the ratings on bilge pumps is overstated in practical applications. (ie, don;t believe that 1500gph rating) Couple this with combining pump outputs thru the same fitting will drastically reduce the output of both pumps and I start getting worried about the effectiveness of my pump configuration.

My purpose for installing a second pump is for those rare but serious situations where a another bilge pump and an extra thru-hull fitting might be what saves my boat.

I've been caught in some real bad weather and had the boat fill up on me with a 750gph pump running constantly. That's scary because I would have been in bad shape if something flooded that caused me to lose power and blow up against the rocks.

Here's a few things I read that made me change my mind...
- Consider that a 2 inch hole, a foot below the waterline, will allow 79 gallons of water per minute to flood into the hull. That can fill the average 30 foot hull and sink it to the deck in about 30 minutes.
- The cost of a good bilge pump & installation is the cheapest and most effective insurance you can purchase to keep the vessel off the bottom of the lake.


http://www.seamagazine.com/hob...=1946
http://www.yachtsurvey.com/bilge_pumps.htm
http://seagrant.uaf.edu/bookst...s.pdf

Anyway... Call me paranoid, but I have alot of respect for the water & the weather. Just my $0.02.

[Daddychatham]

I just added a bilge into my Bullet. I put a T in line to the first and added a scupper 3/4" inline check valve to prevent the water from running back. If you have 2 you would wnat one thats an auto, I dont see a benefit in having 2 manuals. If you want to do that, just get a 2000gph bilge, and be done with it.

[VinceJE]

The point here is redundancy as much as volume capability. I'm adding a 1000gph auto pump (switched with water witch) in addition to the original 750gph. This way I can depend on the auto pump to handle the normal splash, light rain, etc. and I can always hit the switch on the original pump when I'm in a heavy downpour or have it as a backup ug the auto fails.

[Daddychatham]

Thats the reason I added the extra. I want the auto to be my main one and then the manual for the heavy flow days

[ranger230v]

Vince I'm with you. If your adding another bilge pump I'm assuming its because you want to be able to pump as much water as possible, as quickly as possible, out of your boat. If thats the case, I don't think running "T's" and "Y's" and check valves is the way to go. Put some blue painters tape down and drill your hole. It's not hard, use a fresh hole saw and let it do the cutting, you don't need to push real hard to get thru. Take your time.

Getting back to the original question:


http://www.iboats.com/Brite-Pl...40098




Modified by ranger230v at 5:37 PM 8/16/2010

[VinceJE]

I found some real nice ones made by SouthCo (used to be Orcas?). They are PVC body with polished SS outer flange. The look of SS for 1/3 the $$. Problem is... I haven't found anyone online that carries the 90* 3/4" & 1-1/8" fittings.




Modified by VinceJE at 3:47 PM 8/16/2010

[MBragg8]

This should help..

https://www.flow-rite.com/cata...tings

[STRATOS 1]