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... both the same. SolaRoll was a six-tube web-connected extrusion, while Radiant Roll started as four tubes, then was made as two. Parts are no longer available, as the parent company Besicorp closed Bio-Energy's doors at the end of 1998.
Nearly Forgotten Facts Dept.: It's EPDM, no barrier, unreinforced, .203" ID, .338" OD. Diameter of punched header hole was .305"-.310". Teflon insert was .250" OD, .750" long. Splices were made with 3/16" brass barb fittings. There was an aluminum insert tool called a "SolaSert" that was used to make the header connections.