Dear Sergeant F. J. W., No sweat. FSN 5330-905-6032 will get it for you. In fact, the O-ring fits all U-182/U and U-229/U connectors, like, f'rinstance, those on the M-80 micro- phone and H-161,MK-525/G and MK-526/G head- set-microphone. The stock number is getting added to parts manuals or to the functional parts lists of the basic TM's. To keep the O-ring in place ... and to lengthen its life ... give it a light coat of silicone compound, FSN 5970-224-5277. Wf-Vft FOR A HEALTHY HEADSET \\ hat ith the push on for new FM-series equipment and such, things are getting a bit right on replacing com- ponents of the old standardized radio series-'specially audio accessories on sets like the AN/GRC-3. In the "real tight" class is the H-63/U headset-mike. Give that babi plenn TLC. because getting a replace- ment is going to take time. time. time, Tom. Also, if that little joker needs repair. get it done now. Never let it get to the point where it has to be replaced. Like. it's tight.