Those of you who have a mains pressure tap inside the caravan may find that it leaks after a while. Ours did. Drip Drip Drip Drip... I tried everywhere to get a new tap washer, but no go - the washer was far too small for commercial plumbing supplies. Eventually, I found the answer - the rubber washers uses under the heads of roofing screws. Simple, cheap as and readily available if you wander around a building site