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The 852-B needle valve is a pilot speed control valve.
The body is brass and the stem is stainless steel with a fine thread for controlling flow. O ring packing assures leak proof, trouble free service. 1/4 in / 7.5 mm NPT female to female end connections.
852-B Needle Valve Speed Control

Specs

Maximum operating temperature
180°F (82°C)
Maximum working pressure
400 psi (27.6 bar)