Used on uh-1 series helicopters. 3a first fluid end connection thread class 3.501" overall length 12 first fluid end connection thread quantity per inch coupling bulkhead half oil line frangible bulkhead fitting on first fluid end; threaded connection on second, self sealing, end; frangible anodize body surface treated male coupling half unj first fluid end connection thread series
3a 1st end thread class 16 1st end thread quantity per inch flange shape heptagon with 7 bolt holes 0.257 in. dia anodize surface treated un 1st end thread series
