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The FS20x4 Fuel Selector is designed for high wing aircraft where it is possible to feed from both tanks symultaiounsly. Porting for the both position is done internally in the valve so there is no need to T the two tanks together.
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On the FS20x4 there are 3 ports. The lower port is an AN-6 Male fitting. This is the outlet and it is machined to the base of the valve. The inlet ports can be any of the 3/8" fittings that Andair supplies and are at the 9 O'clock and 12 O'clock positions when looking at the valve with the brass ball spindle pointing upwards (see image below). At the 3 O'clock position there is a blanking plate that covers up a PTFE gland that opposises the forces of the other PTFE glands.
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As all of the valves, there is a nice solid detent in each selected tank position and a clearly labled facia plate. To avoid incorrect fitting this plate can only be fitted on in one way with respect to the valve body.
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This valve has found to be popular in the RV's and other aircraft where two wing tanks are required to be switched frequently so that balance is maintained. As the action is very smooth, it easy and pleasurable to change the fuel over.
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