SAFETY MAIN STOPPER CO., INC.
DEPENDABLE MAIN BAGS TYPE "B"
TYPE "B"-of medium weight. Sizes 2" to 48."
TUBES-All bags have tubes large enough to permit EASY INFLATION and QUICK DEFLATION. Tubes are reinforced at the neck of bag.
Since these bags have no covers to contain them, inflate only with enough air to remove wrinkles from bag and to expand the bag to a diameter of about 1" larger that the size stamped on it.
Gas Main Line Pressure must NOT exceed 8 in. W.C.
ALWAYS use two stoppers in series with a vent pipe between them.
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