They are like hens teeth to find, as prof says Truma stoped doing these (many years ago now.Its for my Coachman Caravan and I like to have a spare one. I believe it may be a TRUMA Part.
Or has anyone got a Part Number so I can search it please.
Thanks.
Sorry Prof I duplicated your information.The item is a "Truma ultraflow surge damper pressure switch" I have checked the Truma web site, and it seems they no longer sell this item.
However Whale have made pressure switches and surge dampers for a long time, and whilst they would need a little modification to the pipe layout, they would do the same job. See here