Ordered and fitted a DHW diapragm kit for my Baxi 105e combi-boiler. Only slight worry is that I have a tiny o-ring left over in the kit and couldn't see where it was supposed to fit?

I could see that the washer in the kit went over the new brass nut..... but puzzled by the o-ring.

The system appears to be working now, but I'd hate to spring a leak in the near future for the sake of an o-ring.

Guidance appreciated!

Andrew, February 2009

Thanks Daz! It all makes sense now.

Much appreciated.

Andrew, March 2009

o,ring fits in top of diaphragm housing top section under brass nut creating water seal which spindle pushes thru [called stuffing box]

daz, February 2009