Soft Goods Overhaul Kit for Kirby Morgan Super/Lite 27 Dive Helmet. O-rings should be lightly lubricated with food grade silicone Dow Corning 111 or equivalent in accordance with the operations and maintenance manual. Cristo Lube may also be used. At a minimum all helmet or Band/Mask o-rings should be replaced at least once a year in accordance with the A2.1 for the helmet or mask being inspected. During daily and monthly maintenance disturbed o-rings and valves may be reused providing no damage or deformation is found. O-rings and valves may require replacement more often than yearly if the helmet or mask use is extreme or if the helmet or mask is used in waters containing oil or chemical contamination. Daily cleaning and inspections as well as performing the monthly inspection A2.2 will identify the need more accurately than simply placing a number of hours between overhaul.Store spare o-rings valves and soft goods in a cool dark dry place. Avoid prolonged exposure to temperatures above 90 degrees Fahrenheit andor exposure to ultra violet rays. Do not lubricate exhaust valves. Lubricating valves can cause dirt to stick allowing leakage.