This funnel was Pick of the Month in the August 2022 magazine. We were eager to try it out and ordered it straight away. Unfortunately it didn't fit our 2018 Coachman VIPO 460. We were disappointed and contacted Kevin Kirk who explained that he had produced it to fit Thetford toilets and the toilet in our van was a Dometic. There was no quibble in returning and refunding. However he has now designed one to fit a Dometic toilet and sent us a prototype to try out. It fits like a glove and we are very happy with it, as we are with the excellent customer service delivered by this small company. This is such a simple idea which works well. If you, like us, have a Dometic toilet, it may be worth e-mailing Kevin to see how the production is getting on. You won't regret it.