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I use pond foam. They use it in between the rocks to hold them in place. It is 100% water proof and is close cell formula and is black in color and stronger then great stuff. You can get at some of the H\D not all of them carry it. Or can go to a pond supply store.
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Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails 
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