Mpt?
 

I picked up fittings for my new chiller and the threads seem to be the wrong pitch. I have some 1" threaded fittings and they don't match up. The instructions say to use 1" MPT threaded one end and barbed on the other. Does MPT mean metric pipe thread? If so does anybody know where can I buy some?

American National Standard Pipe Threads NPT: National Pipe Taper Thread A sealant compound or Teflon tape must be used for a leak-free seal.
FPT: female (internal) National Pipe Taper threads
MPT: male (external) National Pipe Taper threads
NPTF: Dryseal American National Standard Taper Pipe Thread No sealant is needed for a seal.
NPS: American Standard Straight Pipe Thread Used for mechanical joining -- holding a fitting in place. An O-ring or a metal seal is required.
NPSF: Dryseal American National Standard Straight Pipe Thread
British Standard Pipe Thread BSPT: British Standard Pipe Taper threads
BSPP: British Standard Pipe Parallel (straight) threads

Here's a link for some more info like threads per inch and metric sizes - described as M( dia. in mm). eg M4.00
http://www.engineeringtoolbox.com/np...ads-d_750.html

Thanks for the info. That is very helpful. I need to try and find the tapered fittings.
No wonder the fitting I got only went in a few threads worth. :redface: DUH!!

All the regular joe PVC fittings at Home Depot and Rona are NPT (tapered.) I'm not sure what you have if it doesn't fit.

What chiller do you have? Some have metric fittings.

I found what I needed, thanks.
The chiller is an aqua medic (made in USA)