The MaxEvac™ Hose MAXIMIZES your vacuum efficiency for faster evacuations. The large 1/2" diameter dedicated evacuation hose MAXIMIZES the suction capacity of the vacuum pump. Smaller diameter hoses restrict flow pump and limit the vacuum pump from achieving its full suction capacity. Included is (Part# MEHP) the metal hose protector that keeps your hose sealed and protects it from dirt and debris. Recommended to be used with (Part# MECT14) Valve Core Removal Tool, (Part# UYA38) MaxEvac™ Y Adapter and (Part# UVG2) SmarTech Digital Vacuum Gauge all sold separately.