Sourcing 28mm hull fittings for bilge pump

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pcatterall

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Thought I would fit a second bilge pump. Bought one requiring 1 1/8" hose as per the pump fitted.
Just managed to source hose but completly stuck for hull fittings, tried all the usuall suspects ASAP, main chandlers without luck. Plenty of 1" and 1 1/4" . I need a hose tail, ball valve and hull fitting or, of course an adapter!!
Any real good suppliers recommended?
Thanks
 
Bell flow systems will supply a hose tail to suit 32mm ID hose, that will take you to 1 1/4" BSP so you can go from there with normal chandlers stock valve & skin fitting.
 
I don't work naturally in fractions of an inch, but I've just pulled out a ruler and 1/8" doesn't look that much of a difference to me.

Get the bigger fitting, and a heat gun.

Get the hose nice and hot and floppy and the fitting at least warm so that it doesn't instantly suck all the heat out of the hose, then firmly push the hose onto the fitting with a rotating motion in the direction that will open up the spiral reinforcing. A little bit of suitable lubricant might not go amiss either; I have a bottle of silicone stuff used by plumbers to ease rubber-sealed soil pipe together, but soap would probably do.

Added bonus is that if the jubilee clip ever comes off, the hose will probably stay firmly in place :)

Pete
 
Thanks PRV. I can try forcing a bit of 1" 25mm hose onto the 1 1/8" pump then I can choose from a large selection of valve/tail/hull fittings.
Went back to ASAP and note that there medium size pumps have 1 1/8" outlets but they dont stock the complementary fittings ( except just a plastic through hull fitting with a push fit tail and I need threaded)
Thanks again
 
I had the same fun trying to find that size fitting... In the end went for a pump with 1 1/2" outlet and then had fun trying to find cables/switches to cope with a 25A current!

Anyway.. back to sourcing a 1 1/8" fitting.. a quick search shows they are available so your local chandlery should at least be able to order them from their local supplier.
http://www.jabscoshop.com/marine/pu...ccessories/60-rule-1-18-thru-hull-fitting.htm

BTW - using a 28mm dia hose instead of 25mm dia hose will increase the cross sectional area from 490 sq mm to 615 sq mm... a 25% increase..

I personally would not go for the smaller hose due to the huge reduction in output.
 
pcatterall said:
Thank you David, I will try Bell. Problem is my hose has to be 28mm (1 1/8")
I am at aloss to understand why pumps are made to suit this hose when the fittings are so difficult to locate.
Click to expand...
You should be able to expand a 1" hose to fit. Hairdryer, hot air gun or hot water and a screwdriver with a suitably tapered handle should do the trick.
 
pcatterall said:
Thanks PRV. I can try forcing a bit of 1" 25mm hose onto the 1 1/8" pump
Click to expand...

I meant the other end - get your 1 1/8" hose onto a 1 1/4" skin fitting. Still a 1/8" difference, but as a smaller proportion of the total size so less stretching needed. Using the larger hose size will also help output as Martin says.

Pete
 
Thanks all. Yes will use the proper ( bigger section ) hose and force fit to hull fitting.
But.... see that there is one hull fitting from asap; a 29mm od 90 degree with hose tail, my hose will surely stretch 1mm!! and I will loop pipe to deck height to obviate need for valve.
Thanks
 
I also had the same problem a couple of years ago and did, eventually, track down a plastic 1 1/8" skin fitting - only did straight ones, not elbow. Other problem is, I cannot remember where I found it but there are out there somewhere in internet land!
 
pcatterall said:
Thanks all. Yes will use the proper ( bigger section ) hose and force fit to hull fitting.
But.... see that there is one hull fitting from asap; a 29mm od 90 degree with hose tail, my hose will surely stretch 1mm!! and I will loop pipe to deck height to obviate need for valve.
Thanks
Click to expand...

It'll only need to stretch less than 1/2 mm as 1 1/8" is a nats cock over 28.5 mm.
I can machine you up an adapter or something to suit if you get stuck.
 
Couple of further thoughts
1. as the discharge is going to be above water level, it would be OK to use a plastic skin fitting. These are available from various sources on-line in 28mm size.
2. I wouldn't put too much of an anti-siphon loop in as this will increase the head on the pump and reduce the output.
 
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