Suitable for use with clean water that does not contain abrasive particles and liquids that are not chemically aggressive towards the materials from which the pump is made. They are easy to use and are economical, they are ideal for domestic use and in particular for distributing water in combination with small pressure sets and for the irrigation of gardens and allotments. The pump comes complete with a flap-check valve. Keep the water pressure stable to let water heater normally working. The pump should be installed in an enclosed environment, or at least sheltered from inclement weather.