DRAIN VALVE

Operation: Manual.
Application: Universal for truck, tractor, and trailer air brake systems.
Thread Size: 1/4 in. NPT (male) with sealant.
Profile Design: Low profile.
Material: Constructed with durable materials (often brass or metal alloy, though specific material is not consistently stated across sources for this exact part) designed to withstand harsh operating conditions.
Heated: No, this is a non-heated version (heated versions have different part numbers, e.g., KN24001).
Cable: Does not include a pull cable.
Note that maximum pressure ratings are not specified for this exact part number in the search results, but similar industrial valves often handle high pressures common in air systems, such as up to 200 psi.
These specifications detail the manual operation, thread size, and universal application of the ZZKN21100 drain valve.