Author Topic: brass water drain tap  (Read 186 times)

jos2000

  • Newbie
  • *
  • Posts: 4
    • View Profile
brass water drain tap
« on: November 17, 2020, 08:00:20 PM »
Hi There,

I have a Lister JP2 and I'm looking for a brass water drain tap (see picture).

Have found some, but I'm not sure what type I need to fit in. Do I need a 1/4" of r 3/8" BSD?

Hopefully somebody out ther nows  ;D

Best Regards,

Jos

cobbadog

  • Sr. Member
  • ****
  • Posts: 474
    • View Profile
Re: brass water drain tap
« Reply #1 on: November 18, 2020, 12:43:44 AM »
Hi Jos,
Sorry I cant help with the exact size but what I do is measure the hole size and compare that to a number of taps or using the hole size Google it. I am not familiar with BSD but I am with BSPT (British Standard Pipe Tapered). If you meant BSPT then the following sizes may help;
1/4" BSP =11.2mm drill size
3/8" BSP = 14.75mm drill size
I feel it should be the tapered thread and not a parallel thread which is BSPPL where the drill sizes are slightly bigger, 11.5mm & 15.0mm respectively.
Sorry for the detailed reply.
Coopernook - the centre of our Universe.

jos2000

  • Newbie
  • *
  • Posts: 4
    • View Profile
Re: brass water drain tap
« Reply #2 on: November 18, 2020, 09:37:31 AM »
Thank you
I'm gonna take a look this friday

38ac

  • Hero Member
  • *****
  • Posts: 1844
    • View Profile
Re: brass water drain tap
« Reply #3 on: November 18, 2020, 11:24:16 AM »
I agree with Cobbadog. On every Lister of that vintage the fittings, meaning plugs, taps, even some of the tube nuts are BSP. If set up for a sealing washer there will be an area machined flat around the threads and the tap will need BSPP threads and you need a seal washer. More likely it uses the tapered version or BSPT.
Collector and horder of about anything diesel