Posted on 08 May 2014
Well you can do , but is it wise you are open to two problems.
Firstly if your on board pump has a larger flow ltr/min than the mains ( quite possible on several sites we have stayed on) you will get surging and intermittent flow from your taps shower etc. and possibly a bit of banging caused by cavitation at your pump.
Secondly you are relying on a plastic non return valve and the integrity of your internal pipe connections to obviate any chance of a free flow of water into your caravan.
If you connect via an Aquaroll you remove both problems before they occur