Uniweld’s MaxEvac™ Kit 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 and limit the vacuum pump from achieving its full suction capacity. The Y adaptor provides a dual hose connection to any vacuum pump and the 20 micron rated valve core tools remove the restrictive high and low side valve cores to significantly increase flow. The metal hose protector keeps your hoses sealed and protects them from dirt and debris.