The Meriam ZA9000016-90727 Pete's Plug Adapter kit is used with the Meriam M201 rotary gas meter tester to take differential pressure readings from a rotary gas meter. Brass and aluminum fittings are durable. The adapter has a Y-1/8" needle and is 3' long.

Pressure gauges are instruments used to measure the pressure of a gas or liquid inside a vessel and, often, to help ensure the optimal amount of pressure for a given application. Pressure gauges can range from everyday instruments, such as those used to measure the air pressure in a car or bicycle tire, to highly accurate gauges used in mechanical and industrial processing. Most often, pressure gauges measure pressure relative to a reference measurement. Gauge pressure measures the pressure of something relative to ambient air. For example, a tire pressure gauge or a blood pressure gauge measures the air in a tire or blood flowing through veins relative to ambient air. Differential pressure is the difference in pressure between two points, such as when measuring liquid flow along various points in a pipeline. An absolute pressure gauge measures pressure relative to a perfect vacuum, for example, an atmospheric or barometric pressure gauge. All types of pressure gauges include either a male or a female mount to connect to the vessel where pressure is being measured, and they display results on a dial with varying increments of measure across a given range.

Meriam manufactures process measurement instrumentation including manometers, pressure gauges and transmitters, hand pumps, and flow indicators for the oil and gas, chemical, petrochemical, and automotive industries. The company, founded in 1911, is headquartered in Cleveland, OH.