The Propex inlet is BSPT, not metric. Fittings can be found here:
http://shop.hoseandfittings.com/catalog/Fitting/Brass/Pipe_-_British.html
and
http://mcmaster.com

Of course, there is no need for any of these unless you are installing in
such a way that a different fitting is required. I always keep extras of the
stock Propex fittings here, in 1/4", 5/16", and 3/8" tubing sizes.

The exhaust pipe is the unpainted, stainless steel pipe.

Karl
www.westyventures.com
www.propexusa.com

On Fri, 30 Oct 2009 08:34:36 -0400, W Monk <billmonk@GMAIL.COM> wrote:

>Karl and Frank,
>Question about the british pipe threads on the fitting that goes into the
>heater. I know the end going into the heater are metric ,but are the threads
>on the end with the compression fitting also metric? I made sure not mix up
>any of the parts ,but still curious. I also have
>a question about which pipe is the exhaust on the bottom of the heater. Is
>it the painted or the silver pipe thats the exhaust?