Revolutionary aircraft grade aluminum frame with dual handles (no welds to fail). Lifetime frame warranty. 50 mesh inlet filter. Adjustable pressure unloader. Low oil shutdown Kohler, LCT & GX models only. Pneumatic tires. Dual padded shock absorbing feet. 3/4” cold-rolled steel axle. Kohler SH, Honda GC Series consumer grade & GX Series commercial grade engines are 50 state approved.