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Single sided 2 inch tape

Single sided Venture tape for sealing polyethylene sheet 

This is for use for joining the various polyethylene waterproof membranes.  It is 2" wide.

VentureTape 1585CW-P2

http://www.venturetape.com/product.php?productid=1340&cat=50&page=1

It costs about $13.50 for a 222 foot roll.

http://www.theenergyconscious.com/wea2114.html