great durability and resistance to detergent solutions is ideal for applications wherein the invention is used with clothes washing machines of course to firmly secure the various elements comprising each of the valve bodies together in watertight fashion a suitable adhesive cement may be employed at the joints therebetween while the above described valve embodiments are especially adapted for use with machines such as clothes washers dish washers and the like it is believed that such are also well suited for use in other environments for instance such valves may be of particular utility in an oilfield or industrial settings as a check valve capable of alerting users of excessive back pressure in flowlines carrying liquid chemical compositions additionally with the provision of a suitable electrical control circuit the instant valves may be of use in the computer controlled 34 smart 34 homes now being developed wherein a back pressure situation in a drain line may be responded to by a preprogrammed digital device further as described hereinbelow the inventive valves may be used in the distribution of water through an irrigation system referring to fig6 a building structure 178 containing a clothes washing machine 180 is piped to utilize the waste or 34 grey 34 water generated by the clothes washing machine for lawn and garden irrigation purposes by utilizing such a system the grey water may be advantageously employed and need not be flushed into a municipal sewage system for costly treatment and disposal as shown the washing machine 180 is provided with inlets 182 and 184 from which it.