The valve on the blue line is not what they are referring to. Why can't they just use normal words and say make sure your black tank valve is open before using the san-t-flush tank flush connection. Otherwise you may overfill the tank and no one wants that.
Sorry I'm not normal either so I can't help there.
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Paul Woods
2024 Vegas 26.1
Previous rigs: 2018 Axis 25.3, 2016 Wildwood X-lite 231RKXL, 1998 Thor Tahoe Lite 19UD, 1990 Starcraft Meteor tent trailer.
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