Dumb ? but how do i tell what size pipe I have from filter?

Joe.G

I Need to rerun part of the flexiable copper line that goes from my genral filter houseing to the boiler motor, ther are to lines and both lines get reduced down abot 1 foot from the motor. How do I know what size they are? Thanks

Bill Nye_2

Dumb answer

IPS and copper tube size are different. Having said that the inlet and outlet to your General filter are usually 3/8" IPS. The inlet to your fuel pump is usually 1/4" IPS.

Copper water pipe is usually a "nominal" size and it generally refers to the I.D. of the tubing.

Your oil line is probably soft copper tubing and the size is commonly the O.D. of the tube.

So, to take a guess, the bigger tube is 1/2" OD and the smaller 3/8" OD. Take a small piece or a fitting with you. It really should have flared connections and not compression fittings, do you have a flaring tool?

Joe.G

A buddy of mine does, I thought thats what size it was but I was unsure, Thanks a lot