1 2 to 8 2 of the solenoid valves sv1 sv8 and connecting pipes 220 225 for connecting to the outside connecting pipes 112 116 from the top channel housing 10 are formed also shown are installation holes 226 and 227 and a mating hole 228 for engaging the mating claw 128 of the top channel housing 10 at a point on the circumference diagonally opposed to the installation hole 217 fig1 22 are cross sections at lines 19 19 20 20 21 21 and 22 22 respectively of the bottom channel housing 20 shown in fig5 and fig2 is a front view the right side channel housing 30 similarly comprises an outside plate 30a and an inside plate 30b and is structured and bonded similarly to the top channel housing 10 this outside plate 30a however is flat the inside plate 30b comprises six output pipes 307 312 projecting up connector ports 301 304 for connecting with the output connecting pipes 1 3 to 4 3 of solenoid valves sv1 sv4 and two projecting output pipes 305 and 306 see fig2 28 fig2 28 are cross sections at lines 26 26 27 27 and 28 28 respectively of the left side channel housing 30 shown in fig6 the left side channel housing 40 similarly comprises an outside plate 40a and an inside plate 40b as shown in fig3.