Gasland chef gas pressure regulator has 1" openings for 3/4" gas pipes. The 3/4" gas pipe means interior diameter 3/4" but outside diameter is 1", refer to the pictures before buying. Do not install the regulator too close to the heating equipment or use in very cold environment.

PRODUCT DESCRIPTION

Brand: Gasland chef
Gas type: Natural Gas (NG) 
Inlet pressure (CSA rated and Maximum operating): 1/2 PSI (34 mbar) 
Outlet pressure range: 3" - 6" Water Column
Ambient operating temperature range: 32°F - 225°F (0°C - 107°C)
Refer to the pictures on how to find the correct pipe thread size. This regulator has 3/4" openings for 1/2" gas pipes. 1/2" IN and 1/2" OUT Female Pipe Thread. The 1/2" gas pipe means interior diameter 1/2" but outside diameter is 3/4", refer to the pictures before buying.

ATTENTION

NOTE: GAS PRESSURE REGULATORS WILL NOT TURN OFF THE FLOW OF GAS
The pipe fittings for this regulator are based on NPT pipe threads - dimensions according ANSI/ASME B1.20.1 standards
Install the regulator properly with gas flowing as indicated by the arrow on the casting
*NOTE - Do not install the regulator too close to the heating equipment or use in very cold environment. Heat or cold can change the resistance of the spring inside the regulator

KINDLY NOTE

WARNING: The NPT thread size is NOT referring to the size of the thread itself!
The plumbing industry standard for the pipe sizes is NOT always as straightforward as measuring the pipe
Measuring the pipe will often mislead you into choosing the wrong pipe size
The "pipe thread size" is measured and based on the inside of the pipe
A lot of people measured the thread / the opening for the thread/outside diameter！