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i need this tube to build solar evacuated tube must have at least 3/16 thick wall. 3 inch diamater and be 8 feet long. must be able to handle heat up to around 400 deg F I am interested in any tube that has specs close to these. must be very transparent and reflect as little light as possable glass, tube 1 piece glass tube 3 in od 8 ft long must handle 400 degrees F