Introducing Tectran's Knob Style Shutoff Gladhands -Durable Construction: These shutoff gladhands feature aluminum construction, ensuring durability and longevity -Snap-Stop Knob: The centered low-profile \"snap-stop\" knob provides easy and secure operation -Reliable Seal: Equipped with a rubber gladhand seal for leak-free connections -Bulkhead Mounting: Designed with a bulkhead fitting for convenient and secure mounting -Emergency Gladhands: The emergency gladhands come with a second port for pintle hook lines, enhancing versatility and functionality Upgrade your air brake system with Tectran's Knob Style Shutoff Gladhands, offering durable aluminum construction, reliable sealing, and convenient features for a dependable and safe connection.