Cannonball Engineering, LLC 1005 E. Hwy 54 P.O. Box 289 , Kingman , Kansas 67068 USA About Solutions products Companies Cannonball Engineering, LLC Products Locking Valve System Locking Valve System 0 Share Our unique locking valve stops arms from creeping out when carrying hay bales. And, unlike other units on the market, our design significantly limits truck frame stress. Most popular related searches hay bale hay baling Customer reviews No reviews were found for Locking Valve System. Be the first to review! Add your review Publish your review Great! review successfully added!