What is the size of the inspector's test gauge connection?

The inspector's test gauge connection is standardized at a size of 1/4 inch. This size is commonly used in boiler systems to provide accurate pressure readings without the risk of excessive flow that could lead to inaccuracies. It allows for the installation of pressure gauges that can effectively monitor the functionality of the boiler while ensuring that the connection is compact enough to fit in the designated space.

Utilizing a 1/4 inch connection is crucial for maintaining the integrity of the pressure measurement system, as it prevents the introduction of variables that larger connections might present, such as increased flow rates that could result in fluctuations in pressure readings. This standardized size helps inspectors ensure consistency and reliability when measuring system pressures across different installations and types of boilers.