Give the check valve the old " blow and suck" test :-)
Install so the pump pushes air to chamber, but on pump back stroke the air doesn't get pulled back.

Alistair

> On Aug 6, 2017, at 9:27 AM, Stuart Hertzog <stuart@STUZOG.COM> wrote:
> 
> Hi folks,
> 
> I'm unable to light the Dometic 182B fridge in my '84 Westie since I
> fitted the GoWesty modification and upgraded fan. My question is: which
> way round does it fit? Following the size of the supplies short hoses,
> it would seem to indicate that the tapered end should face the air pump,
> but I received a message from GoWesty, which I cannot find again, that
> it may be the other way round. The one-way vale is shaped like a
> spinning top, with one flat and one rounded end. Anyone know which way
> it goes?
> 
> Stuart