The GU10A requires water cooling. Specs indicate that a five gallon holding tank is required.  After a lot of searching, decided to have a custom aluminum tank made from a boat shop in Florida.......perfect. Placed order for a fill lid, two inlets, two outlets and a level indicator ports. The tank came in looking ugly and lots of weld marks and such.  Dr. Spark started his magic cleanup to make eye appealing indeed and after two months the tank is accepted for the LP VTTC. Tab on pictures below to enlarge.