Agree there ricky , the maximum weight limit in health and safety rules is manual lift max of 25kg and with two people 40kg and anything over that is mechanical lift like a fork lift . And most people can lift 30 kg .The drainage systems they do a one way valve that goes in to these types of boats and there on £10 each just a case of putting a circular hole pushing In and tightening up . Simples Those hoovers are as good as a chocolate teapot take ages to bail out water It must be quite annoying keep lifting boats all the time I would hate to be working there and here people moaning , me included .