of metal e g aluminum alternative lower plate 204 and intermediate plate 208 can be made of plastic upper plate 202 is threaded to accept screws inserted through headers 108 and 116 and plates 204 and 208 to bolt those headers and plates to upper plate 202 alternative gaskets 206 a and 206 b are located between intermediate plate 208 and upper and lower plates 202 and 204 respectively to seal integral flow paths located on the insides of plates 202 and 204 like paths 134 and 138 of fig7 and around valve ports middle plate 208 separates gaskets 206 a and 206 b and provides a surface against which gaskets 206 a and 206 b can compress fig9 b shows pump 146 removed to illustrate that the pump mounts to elastomeric sealing inserts 214 placed in intermediate plate 208 fig9 a and 9b illustrate that clamp 150 and conductive pad 152 connect to metallic upper plate 202 in the illustrated embodiment so that the above described heat sinking can occur upper plate 202 includes a recessed area 216 to with a saddle that is designed for the heat sink mounting of pump 146 to upper plate 202 recessed area 216 forms or includes a saddle that pump motor 154 fits into the saddle conducts the heat from pump motor 154 into upper plate 202 which is the only metallic plate as discussed in.