Meanwhile PCL’s leading high performance two-stage valve design ensures accuracy and longer life compared to competitors’ single-stage mechanisms, where filters are used in an attempt to protect the product. This can result in over 50% reduction in product life, with filters slowing down inflation rates, wasting valuable technician time. Tests show the 'Made in Sheffield' AIRFORCE MK4 can cover more than ten times as many cycles as its main contender, making it the product of choice for users who prefer a linear tool.