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Old 22-12-2010, 07:53   #1
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BSPP Threaded Bronze Pipe Caps ?

Can anyone point me to a good source for BSPP threaded bronze pipe caps? I am replacing my thru hull valves and am going to be capping several that are no longer being used. The through hull fittings are not NPS thread they are BSPP. I am able to order through Forespar BSP threaded ball valves which is what I will be using on all the thru hulls that are remaining in service. I dont want to remove and glass up the unused thru hulls because I may go back to using them in the future and will just fit a valve then.
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Old 22-12-2010, 08:57   #2
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Assuming you have a FRG hull why not just glass in the old through-hull holes and be done with it. I did that by beveling the outside of the old hole and then epoxy-in a wooden plug in the inside mounting pad. Then used fiberglass and resin to fill in the beveled hole until faired with the outside of the hull.
- - Any metal fitting extending into the sea are subject to electrolysis and will (many factors determining) eventually fail.
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Old 22-12-2010, 09:02   #3
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I do not wish to glass up the old thru hulls because I may want to go back to using them. They are Bronze and in excellent condition. What was not in good condition were the ball valves that were threaded onto the thru hulls. I have removed all of them and am replacing, however there are 3 that I want to cap. Hence the need for the correct threaded caps.
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Old 22-12-2010, 09:10   #4
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Had you been in the UK, I would suggest gas (natural gas, not gasoline(petrol) ) fittings
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Old 22-12-2010, 09:15   #5
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Yeah thats sort of the trouble here. My boat, Wauquiez Amphitrite 43, was built in France and they used wonderful bronze thru hull fittings but the threads are BSPP which have a different thread angle than NPS and of course are straight threads so NPT is out of the question. I have a machinist friend who has the ability to cut BSPP threads so we may end up making our own caps but I was hoping with a little research to find some off the shelf. Mcmaster Carr typically great for this sort of thing are of no help.
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Old 22-12-2010, 09:24   #6
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Old 22-12-2010, 09:31   #7
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Just emailed them Gordo thanks again you always have a knack for finding this sort of stuff!
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Old 28-12-2010, 14:23   #8
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Maryland Metrics says:

We only stock these in BSPT thread in malleable iron.
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Old 28-12-2010, 14:43   #9
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You could fill the old valves with epoxy filler and use those as the caps.

Or a couple possible sources: BSP Threaded Fittings, Buttweld Pipe Fittings, Fasteners, Flanges

Pipe Cap,Pipe Cap Fittings,Threaded Pipe Caps,Pipe Cap Fittings Suppliers
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Old 28-12-2010, 20:46   #10
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You really need BSPT caps. BSPP will require a fair bit of tape to seal
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Old 29-12-2010, 10:23   #11
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I was thinking Locknuts but I suppose I could use BSPT female threaded caps. Need to keep looiking for them in bronze. Maybe someone from the UK could help?
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Old 29-12-2010, 11:16   #12
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Mc Masters Carr has something called BSPT in stainless Steel.
MAybe??
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Old 29-12-2010, 11:32   #13
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Yeah was really hoping for Bronze. Not really a fan of Stainless when I can avoid it.
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