The core 1620 can advantageously include an opening 1630 such that the core 1620 can be mounted or other affixed to {HEAD ~ a stem} of a cartridge or {TAIL ~ other valve housing} 
of
The core 1620 can advantageously include an opening 1630 such that the core 1620 can be mounted or other affixed to { HEAD ~ a stem } of a cartridge or { TAIL ~ other valve housing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL