I believe the part you are looking for is a "7/16" C Tube Cap". Or as it is more commonly called a 7/16 end cap in pneumatic, hydraulic, an= d plumbing operations. They are a stock parts and come in a variety of lengths and even tapers. Us= ually made from brass (air), bronze(water), steel(hydraulic), or even chrom= e plated. If there is someone in your area that does pneumatic work, they will probab= ly have one in their truck; otherwise, try brassworks.com. -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of= David VanHorn Sent: Sunday, October 25, 2015 9:14 PM To: Microcontroller discussion list - Public. Subject: [EE] An odd fitting I need to find. I need some help sourcing the metal fitting in the picture: http://ecx.images-amazon.com/images/I/310e-2lm8RL._SY355_.jpg It's 7/16 OD, thin wall brass. It matches K+S stock tubing except that the= end is rounded off and closed. http://www.hobbylinc.com/htm/k+s/k+s8137.htm The diameter is critical, the fitting it goes in doesn't flex much. I am not too picky on length, more than half is good, more than an inch is = a problem. A hole in the closed end is actually good, but not critical. Someone somewhere makes these things, it's probably some common thingus used on something I've never heard of. Can anyone here match it up with something? Jewlery fittings are close, but all I've seen are too small in diameter and= only about 1/4" long. Why: I have an antique "Violet Ray" device that I would like to make some ends f= or. It's a rare one, which runs from 32V "farm current". Such devices wer= e made by the truckload around the turn of the century, to cure whatever ai= led you, but the vast majority are 110 or 220V for europe. The farm curren= t device is unique. I could just go buy something like in the pic, but I want to make something= more like a geissler tube, which is a bit of a project. To that end, I've= taken up glassblowing, found a source of uranium glass, built a vacuum man= ifold and "filling station" and learned to seal off these tubes when under = vacuum of 1-10 torr. On Ebay, there is a set of Christmas lights that are for 32V farm current, = starting bid is $750 for eight lamps in a string. http://www.ebay.com/itm/Vintage-Christmas-Lights-Delco-Farm-32-Volt-Noma-4-= Volt-Mazdas-Extremely-Rare-/171975314757?hash=3Ditem280a870d45:g:~rcAAOSw5V= FWHB7f Apparently the decision for 32V went along the lines that farmers generally= suck at being electricians, so 32V isn't too bad on I^2R losses, but low e= nough for few fried farmers. Standard 110V plugs and switches were used th= ough, which could get exciting if you took your farm device and plugged it = in on a trip to the big city. -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .