NORCO MFG. CO., INC.

The Cylindrical Stopper is an inflatable bag with a rugged waterproofed casing that may be inflated to a high internal pressure and will hold against as much as ten pounds pressure in the pipe.

The broad central zone makes contact with the wall of the pipe and holds against a higher pressure than other types of bags.

Cylindrical Stoppers should not be inflated over the pressure given on the direction card fastened to each Stopper. These pressures are:

2 in. ........15 psi 3 in. ........15 psi 4 in. ........15 psi 6 in. ........15 psi 8 in. ........12 psi 10 in. ........10 psi

12 in. ........8 psi 16 in. ........6 psi 20 in. ........5 psi 24 in. ........3 psi 30 in. ........3 psi 36 in. ........3 psi

These pressures leave a margin of safety. They are about half the breaking pressure under test in the shop.

Cylindrical Stoppers inflated according to these directions will hold against a pipe pressure equal to 60% of the pressure in the bag. That is, a six-inch Stopper inflated to a pressure of fifteen pounds, will hold back about ten pounds pressure in a water main.

Use a gauge and watch it.

Taps

For	3-inch Stopper		1 -inch Hole
For	4-inch Stopper		1-1/4 -inch Hole
For	5-inch Stopper		1-1/4 -inch Hole
For	6-inch Stopper		1-1/2 -inch Hole
For	7-inch Stopper		1-1/2 -inch Hole
For	8-inch Stopper		2 -inch Hole
For	9-inch Stopper		2 -inch Hole
For	10-inch Stopper		2 -inch Hole
For	12-inch Stopper		2-1/2 -inch Hole
For	14-inch Stopper		2-1/2 -inch Hole
For	15-inch Stopper		3 -inch Hole
For	16-inch Stopper		3 -inch Hole
For	18-inch Stopper		3 -inch Hole
For	20-inch Stopper		4 -inch Hole
For	22-inch Stopper		4 -inch Hole
For	24-inch Stopper		4 -inch Hole
For	30-inch Stopper		5 -inch Hole
For	36-inch Stopper		5 -inch Hole
For	42-inch Stopper		6 -inch Hole
For	48-inch Stopper		6 -inch Hole

Do Not Pull on Rubber Tube When Removing Stopper from Main

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