Used on wichita class aor. 3a 1st end bulkhead thread class 12 1st end bulkhead thread quantity per inch passivate surface treated unj 1st end bulkhead thread series
3a all ends thread class 2.808" overall length 12 all ends thread quantity per inch anodize body surface treated male coupling half un all ends thread series
3a all ends thread class 2.062" overall length 18 all ends thread quantity per inch supports grumman A10a aircraft anodize body surface treated male coupling half unf all ends thread series
3b all ends thread class 12 all ends thread quantity per inch will operate at minus 20 deg f cadmium surface treated single joint, elbow design un all ends thread series