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