bubbadewsky Posted March 6, 2016 Report Share Posted March 6, 2016 Can anyone post the success of drilling and installing a drain plug for their PTU unit and what size plug. Did you drill while in vehicle Did you use the suggested drilling location posted in earlier threads here. What is the warranty on a PTU unit. Thanks Quote Link to comment Share on other sites More sharing options...
omar302 Posted March 7, 2016 Report Share Posted March 7, 2016 Just yesterday @threeputtpar posted here his guide. Quote Link to comment Share on other sites More sharing options...
Brian K Posted May 29, 2016 Report Share Posted May 29, 2016 Read the other PTU posts - lots of very detailed info there. There is one with pictures that is immensely helpful to get the location. I used 1/4" NPT and all went well. Have you done it yet? Quote Link to comment Share on other sites More sharing options...
DRbillZ Posted May 31, 2016 Report Share Posted May 31, 2016 What is NPT? Quote Link to comment Share on other sites More sharing options...
Brian K Posted May 31, 2016 Report Share Posted May 31, 2016 (edited) From Wikipedia - "National Pipe Thread taper is a US standard for tapered threads used on threaded pipe and fittings. In contrast to standard threads found on bolts and nuts, a tapered thread will pull tight and therefore make a fluid tight seal". You need an NPT tap to make these threads in the PTU so the plug, which also has NPT threads, will tighten up when it is turned in. Generally all pipe is threaded as NPT - not like nuts and bolts. The sizes don't seem to make sense though. I got a 1/4" plug and a 1/4" tap but needed a 7/16" drill bit as the hole size for the tap to thread properly. So when the plug is out, the hole size is almost 1/2" so it drains out quite nicely. Edited May 31, 2016 by Brian K 2 Quote Link to comment Share on other sites More sharing options...
DRbillZ Posted May 31, 2016 Report Share Posted May 31, 2016 Thanks Quote Link to comment Share on other sites More sharing options...
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