Accepts Attwood's 2-3/8" seat mounts and base plates; boat owner can make a cost-effective upgrade. Stainless steel locking pin in the lower tube and inner race in the upper tube combine to prevent the extension post from rotating in the base plate and at the gas strut. Adjusts from 19-1/2" to 23". Meets ABYC torque tests for Type A Driver requirements.
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