3a single pressure connection thread class 3.750" overall length 0.438" single connection outside diameter 20 single pressure connection thread quantity per inch cylindrical unf single pressure connection thread series
2b single pressure connection thread class 0.250" single connection inside diameter 4.094" overall length 2.906" overall width 18 single pressure connection thread quantity per inch rectangular npt single pressure connection thread series
2a single mounting facility thread class 0.375" single mounting facility thread length 2.250" overall length 1.250" overall width circular wafer, bushing mount unef single mounting facility thread series