a stationary port member mounted fixedly in said housing and slidably engageable by said valve members and having {TAIL ~ port means} traversed by at least certain of the valve members for accomplishing at least one vacuum valving function in {HEAD ~ response} to movement of the push buttons between extended and depressed positions, 
a stationary port member mounted fixedly in said housing and slidably engageable by said valve members and having { TAIL ~ port means } traversed by at least certain of the valve members for accomplishing at least one vacuum valving function in { HEAD ~ response } to movement of the push buttons between extended and depressed positions ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH