Jdarwin (2019 3931FB) shows photos of the vacuum breaker located behind the basement wall near the back of the wet bay in post #18 in this thread from April 2022. In post #19 I show the location of the 2nd vacuum breaker. Look for an access hatch in the lower closet.
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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