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[Captain Starfish]

You can make your own with clear pvc tube, micro-irrigation fittings and a length of board.

Basically, you need a board with four or two hoses (depends on # carbs) running vertically into a "manifold" made of T-pieces and elbows at the bottom. About a metre high. Tops of the hoses go to the carbs via straight connectors (which put constrictions in the tube). Fill it to about 700mm high with oil.

Connect to the vacuum ports and off you go - get them level!