The QL01 and QL02 air interlock valves are essential safety components for tank trucks. They are designed to prevent accidental release of hazardous materials during loading and unloading operations.Constructed with a lightweight yet durable die - cast aluminum body, these valves offer long - term reliability. Their 1/4 NPT air - line holes and standardized TTMA and API mounting holes ensure easy installation and compatibility with various systems.The QL01 and QL02 valves feature excellent sealing design, with durable gaskets maintaining positive pressure seals. This not only extends their service life but also effectively prevents leakage. They coordinate and control pneumatic valves within the loading and vapor recovery systems, enhancing operational safety. Whether for API bottom loading valves or vapor recovery adapters, these high - quality air interlock valves are your reliable choice for safe and efficient tank truck operations.