The Truma Ultra flow water pump assembly is ideal for those looking for a way to pump fresh water into their caravan from an external source. The ultraflow assembly connects to your Aquaroll or Water hog and allows water to be pumped through to use in your caravan. This water pump assembly is compatible with both the Ultra flow Filter Housing and the Ultra flow Compact Housing. It comes complete with a trigger type connection, which can be simply connected to caravan and motorhome fresh water tanks