OEM Western Fisher Breather Pressure Control 3/8″ NPT
This is the thread on type. On side to side pumps, this fits right onto the reservoir, but on pumps that are positioned up and down, this cap will thread into elbow # 21726.
Alternate Part Numbers: 21727, 21727-1, 21727-2, 1-W21727-2, 1W21727-2
