Dont worry about the vacuum loose, each of the 6" mounts is rated to a 200lb pull force. And. They can hold up to 48 hours if fully sealed. The red-Line Indicator warns user of any vacuum loss. When it shows less than 100% vacuum left, simply pump the plunger until you reach the original vacuum pressure without removing the cup.
We provide a free canvas bag for better storage, great for rental cars and pack easily into any suitcase for airline travel.
Care and Maintenance To get the most out of your ZUOS rack, inspect it regularly and store your rack in the protective covers after use. Clean the vacuum cups before each use with a sponge or soft cloth, mild dish soap and water. Our recommendation is to check the pump indicator every 4 hours when driving Clean and lube the pumps regularly.