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