The check valve is the brass fitting coming out where it says HOT.
I THINK your valve is in the Bypass position in the pic, but it's not always clear where the handle should be; but you should try it both ways.
If you still have a problem, it may be the check valve isn't opening, or some other issue.
(Have you verified the WH is full? Open the T&P relief valve and make sure you have water coming out. If no water comes out, turn the valve the other way and try again.)
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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