Expanding Rubber Stem Dimensions

Expanding Rubber Stem Details for Square & Round Tubing
Stem # ID of Tubing Rubber Range ( smallest size to largest size )
ER9 3/4″ .720″ to .851″
ER27 7/8″ .852″ to .927″ ( fits 1″ O.D. 16 or 18 Gauge )
ER28 1″ .928″ to 1.029″
ER29 1 1/8″ 1.030″ to 1.140″
ER17 1 1/4″ 1.178 to 1.303
ER25 1 3/8″ 1.360″ to 1.425″
ER26 1 1/2″ 1.426″ to 1.589″ ( fits 1 5/8″ O.D. 16 or 18 Gauge )
ER21 1 13/16″ 1.790″ to 1.850″
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