It's a test where a plastic tube is passed through an artery to the heart. Dye is injected, allowing the doctor to see any blockages in the heart. The typical symptoms include, but are not limited to, tightness in chest, trouble breathing, arm or jaw pain, sweating, nausea. If more than one of these symptoms occur at once, chew a baby aspirin & get to an ER quickly.
Founded in 1946, ACV Triangle Tube is a hot water heating equipment innovator, manufacturer and supplier. Headquartered in New Jersey, Triangle Tube works with residential, commercial and industrial clients to provide space heating, water heating and related HVAC supplies.
And, the PEX collector that I used for our solar water heating system here... A narrower strip of flat aluminum is used under the PEX tubing to provide some additional heat transfer area into the bottom of the tube. In this way, the tube essentially surrounded with aluminum.