Jabsco pump bayonet fitting O-rings

vyv_cox

vyv_cox

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Now retired, anchor swallowed.
coxeng.co.uk
I need new O-rings for my domestic water pump, Jabsco Par Max 3.5 and for the flush pump of my Jabsco Lite Flush toilet and for the outlet from the discharge pump. These are the ones that seal the bayonet fittings that stab into the pump inlet and outlet ports. All are 1/2 inch and seem to be the same size on each unit. Jabsco will not sell me the O-rings separately and want an extortionate amount for the elbows with O-rings, which I will throw away once I have removed the O-rings.

Does anyone have the details of O-ring sizes fitted to these pumps, please? Maybe I can then buy the rings only at a sensible price.
 
I keep a box of O-Rings on board for that eventuality like this. Available in metric and imperial

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http://www.amazon.co.uk/Connect-35160-O-Ring-G-Imperial-Approimately/dp/B007SU5BSG
 
The last time I wanted something similar, I took an old one to an engineers supplier, and they gave me 10. Said it wasn't worth making up an invoice, so I gave them something towards their tea and biccies.
 
Yes thanks, I know of many suppliers and would prefer to use Simply Bearings, from whom I have bought lots of stuff previously. I don't think buying a box of nearly 400 O-rings of unstated material (probably nitrile) makes much economic sense when I only want six. I would like the dimensions of the EPDM rings that Jabsco use so I can buy the right ones at a realistic price, about £7 for 10 instead of £8 for two.
 
Unfortunately I think you will have to go down the measure and work it out yourself route as I can't see that level of information being available to us mere mortals!
 
vyv_cox;5598124. Does anyone have the details of O-ring sizes fitted to these pumps said:
ID 14.20, section dia 2.71 is the best I can do measuring one I have here. Non-standard I'm afraid but the nearest would be a French standard R11 which would then have to be stretched. In the fitting the groove width 3mm, inner diameter 14.8mm, outer diameter varies 18.0 - 18.7. In the pump housing, id is 18.9.

Hope this helps,

Mike
Click to expand...
 
captmikecoin said:
ID 14.20, section dia 2.71 is the best I can do measuring one I have here. Non-standard I'm afraid but the nearest would be a French standard R11 which would then have to be stretched. In the fitting the groove width 3mm, inner diameter 14.8mm, outer diameter varies 18.0 - 18.7. In the pump housing, id is 18.9.

Hope this helps,

Mike
Click to expand...

Further thoughts: you might get away with ISO 3601 o rings, size 113 (13.94 x 2.62) which should be more readily available.

Mike
 
captmikecoin said:
ID 14.20, section dia 2.71 is the best I can do measuring one I have here. Non-standard I'm afraid but the nearest would be a French standard R11 which would then have to be stretched. In the fitting the groove width 3mm, inner diameter 14.8mm, outer diameter varies 18.0 - 18.7. In the pump housing, id is 18.9.

Hope this helps,

Mike
Click to expand...

Yes, thanks very much. If the groove ID is 14.8 could the O-ring be 15.0? I remember a slight clearance between the bore of the ring and the base of the groove. In that case there are 2.5 and 3.0 mm rings as standard. From memory I don't think the ones fitted are as big as 3.0, so maybe 2.5 would be the one.

Vyv
 
vyv_cox said:
Only problem - boat is in Greece, I am in Wales :)
Click to expand...
Par Max 3
Best I can do with the vernier on a bit of rubber is 19.5 OD 14.5 ID 2.8 thick & this is an unused one.More accurate is the size of the bayonet & hole - bottom of o ring groove 15 mm Diameter ,width of o ring groove 3.6mm ,OD of bayonet 19mm ,diameter of hole in pump body 19.5mm.

Hope this helps Jim
 
Yet more info: od of o ring fitted to groove is 19.7. This would give some compression to the O ring when fitted to the housing. In practice a firm push is needed to engage the fitting to the pump. I would suggest you get a selection of o rings around the right size and try them out. For your info, Vyv, the o ring measurements I gave are pretty well right, measured with micrometer + mandrel.

Mike
 
captmikecoin said:
Yet more info: od of o ring fitted to groove is 19.7. This would give some compression to the O ring when fitted to the housing. In practice a firm push is needed to engage the fitting to the pump. I would suggest you get a selection of o rings around the right size and try them out. For your info, Vyv, the o ring measurements I gave are pretty well right, measured with micrometer + mandrel.

Mike
Click to expand...

Thanks again to both.
 
I would not go smaller in section than the 2.8 , we once had a set which did not seal so we reached for something a little bigger in the come in handy box which were ok,presumably o ring material is not a problem as its only water, I could visit my o ring supplier down the road tomorrow with the pump etc & see what they have that will work, donation to tea fund job normaly for small quantities

Jim
 
bristoljim said:
I would not go smaller in section than the 2.8 , we once had a set which did not seal so we reached for something a little bigger in the come in handy box which were ok,presumably o ring material is not a problem as its only water, I could visit my o ring supplier down the road tomorrow with the pump etc & see what they have that will work, donation to tea fund job normaly for small quantities

Jim
Click to expand...

The material they use is EPDM, excellent water resistance. It feels quite soft to me, perhaps only around 50 IRHD whereas nitrile is probably harder in general. I will order some based on the dimensions you and captmikecoin have given me. Thanks
 
I carry some "O" rings aboard, but I also have a knife and some super-glue. Standard practice out in the wilds.
 
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