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Our PVC tubes each have 3 holes drilled in the bottom for drainage and other than that are completely sealed with screw caps at each end. We have one 6" tube and one 8". To fasten we used threaded stock bent into a U and drilled thru the I-beam frame to secure.
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Darwin & Maureen DeBackere
Minnedosa, Manitoba, Canada
2011/3500/Silverado/4x4/DRW/Duramax 
2017/3721RL/Legacy Pkg./Pressure-Pro 
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