Multi-Anchoring Leg Holder.

Bolts to side of dock frame to anchor it in place yet allows vertical movement for water variances.

can also be sleeved with abs plumping pipe for post with auger to ride up and down with out noise , stabilizes your floating dock from side movements,

Note : you should also look at cross anchoring with  aircraft and chain at from and back, especially with bigger fluctuations of water levels on river systems