The opposite side of the carriage is fixedly fitted with {HEAD ~ a compressible silicone rubber} or other resilient valve member in sealing engagement with a port plate to carry out {TAIL ~ vacuum valving functions} 
The opposite side of the carriage is fixedly fitted with { HEAD ~ a compressible silicone rubber } or other resilient valve member in sealing engagement with a port plate to carry out { TAIL ~ vacuum valving functions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL