2b single mounting facility thread class 3.344" overall length 4.125" overall width 20 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series
3a single pressure connection thread class 0.188" single pressure connection thread length 3.550" overall length 20 single pressure connection thread quantity per inch cylindrical unf single pressure connection thread series
2a single mounting facility thread class 0.250" 2nd mounting facility thread length 6.312" overall length 2.812" overall width 24 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series