Working temperature range : 4 to +212 F ( 20 to +100 °C ) MaximumS working pressures 25 / 18 / 12 ( PN-25 / PN-18 / PN-12 High : the spring check valves is also very and prevents liquid backflow Just a few turns , the valves is tightened and no leakage Perfect : Our check valves can be connectes to all pipes , hoses and 1inch male thread according to BSPstandards , this type of valves can be very good to liquid leakage , the installation should be installed horizontally to allow only unidirectional flows of the to avoid accidents : check valves brass structure , resistant , , good ductility at high temperatures , low conductivity , long service life , can be used for a long time Wide range of applications : suitable for water , steams , oil , nitricacid , urea and so on Widely used in mechanical equipment , water supply and drainage , industrial plant , live aquatics plant, Manufacturer: Watreketal