Powerhouse’s Deluxe Air Gauges incorporate a patented internal mechanism which provides far more resilience to extreme punishment. While other gauges have 14 or more moving parts, Powerhouse’s deluxe air gauges have only four! Fewer moving parts means greater reliability. Available in glow-in-the-dark and liquid filled, and every unit includes a high-quality thumb-operated bleeder and swivel nozzle on a 17” Goodyear hose. High visibility with major and minor graduation marks.