which is best seen in fig3 c the pump body 332 is connected to container closure 334 and the two are shown as separate components in fig3 b but may also be formed integrally as a single component the pump body 332 has an outlet 336 and a rigid back plate 338 the flexible actuation membrane 340 has a base 341 a resilient actuation portion 342 a first end 344 a second end 346 and a direction of actuation 348 a groove 339 in the back plate 338 receives the base 341 of the flexible actuation member 340 forming an arcuate pump chamber 322 fig3 c between the actuation membrane 340 and the back plate 338 a liquid tight seal is formed between the base 341 of the actuation membrane 340 and the groove 339 of the back plate 338 the flexible actuation membrane 340 and pump body 332 may be held together by any means such as for example an adhesive a friction fit connection a projection and groove connection through the use of another component to mechanically restrain the component or the like the flexible actuation membrane 340 may be made of any suitable flexible material such as for example latex rubber polyisoprene tpe silicone epdm rubber nitrile rubber or the like in some embodiments the flexible actuation membrane 340 has a shore d hardness of between about 30 and 60 durometer a fluid passage 331 extends from inlet 321 through the container closure 334 and pump body 332 to fluidly connect the reservoir 320 and the pump chamber 322 an outlet passage 333 extends through the portion 336 of pump housing 332 to fluidly connect the pump chamber 322 to a premix chamber 326 in the nozzle 350 a one way outlet valve.