I used 6 inch PVC pipe and a plastic gutter for mine....
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From Central Texas
2014 Cedar Creek Silverback 29IK
2010 Dodge Laramie 3500 Dually
My Steelpony....2007 HD Ultra Classic...done up in a memorial to the 343 firefighters who died 9/11
Never Ever Forget....yes I was a Volunteer FF for 20 years........