Yup. It's a anti siphon valve to prevent sewage from getting sucked into the hose used to flush the black tank. LOTS of them leak.
You can replace it with a higher quality part or omit it (the manufacturer is required to install one, but as far as I know, you as an owner are not required to have one).
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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