3b single pressure connection thread class 0.540" single connection inside diameter 0.750" single pressure connection thread length 4.500" overall length 2.750" overall width 18 single pressure connection thread quantity per inch rectangular npt single pressure connection thread series
Used on johnston boiler model 509s-4pc onboard 378 ft coast guard vessels. 3b single pressure connection thread class 0.540" single connection inside diameter 0.750" single pressure connection thread length 4.500" overall length 2.750" overall width 18 single pressure connection thread quantity per inch rectangular npt single pressure connection thread series