Hi, thank you so much for your help. I will try those people. Kind regards, GaryHello Gazza, Welcome to the forum
The Carver 4000 was last produced in 1999, It was a unique design and when Carver sold their leisure product business to Truma, Truma quickly stopped making all the original Carver designs of heaters and items like the gaskets were not made any more. There may be a few left at a few dealers.
You might try
www.arcsystems.biz
Here are some user instructions for the 4000