M
MattWeth
Saliva is a great assembly lube for o-ring interfaces too. Biodegradable, non-toxic and non-corrosive (although probably best to not let the customer see ). I used it on a shower cartridge last week and routinely give o-rings a good suck (ooh 'er missus) when servicing my diving regulators (it's actually recommended as an option in the service manual for my regs).