Quote: (Originally Posted by
whaam68)

I'm not a Boris user but we have a couple in our club who have had floods. Watching one on deck strip down it seemed like granules of sorb had lodged under the OPV flapper valve in one of the lungs. The unit had passed the pos/neg.
regards
Mike
The plastic plate in the OPV has now been replaced by a larger version, supposedly this reduces the likelihood of lime getting stuck, I have certainly found lime in my OPV in the past and it is a good source of problems trying to pull a negative. The OPV seems to work better when wet so I now dampen it before doing a neg test.
Ian