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