[TR] TR4 Brake Light Switch

[John Finlayson]

Thanks Jeff, and all who replied to my question. I now understand the difference between NPT and NPTF (F for Fuel) pipe threads. NPTF threads form a tighter interference fit  than NPT threads so sealant is not intended to be required....assuming all is in good order.

Thanks again everyone for all the help,
John Finlayson  

----- Original Message -----
From: "Jeff Scarbrough" <fishplate at gmail.com>
To: "John Finlayson" <john_finlayson at telus.net>
Cc: "Triumphs (triumphs at autox.team.net)" <triumphs at autox.team.net>
Sent: Tuesday, June 6, 2017 4:16:39 PM
Subject: Re: [TR] TR4 Brake Light Switch

On Tue, Jun 6, 2017 at 3:00 PM, John Finlayson <john_finlayson at telus.net> wrote:
> The switch has 1/8 x 27 NPTF pipe threads.

NPTF means it's a tapered pipe thread.  Assuming everything is
otherwise in good nick, it shouldn't need any sealant.

Jeff Scarbrough
Corrosion Acres, Ga.