Kestrel Engineering Ltd recently released a new device, known as the Saf-Deflat-Aer Screw-On, which can be very useful in reducing noise levels when deflating aircraft wheels. The device is meant to reduce noise levels by more than 20 A-Weighted decibels and this is a huge reduction in noise levels considering the noise emitted during wheel deflation. For example, the wheel of a Boeing 747 which has been inflated to 195 psi is deflated by removing the valve core. This can result ear shattering noise levels of up to 117 A-Weighted decibels. This levels are very unsafe and very high according to current international safety standards.