MD5591SeaSucker Pro Series Tank Rack Model: MD5591 The Pro Series Dive Rack was designed for tanks with a diameter between 6.7" and 8". Its modular design lets you easily add or remove tank positions using anodized aluminum bungee cord knobs. Protective pad covers included. Specifications Tank Diameter6.7 in to 8 inVacuum Mount6 in, pull-rated up to 220 lbsSize13 in W x 6 in THeight with Cover5 inOff the Wall2 in (tank holder side)Width from WallApprox. 5 in (from center of vacuum pad)