That's the anti-siphon valve for your black tank flush system. They are NOTORIOUS for leaking and often the cause for water damage under the bathroom sink. You can buy one at any RV dealership or, as many of us have done, go to Lowe's or Home Depot and buy a brass anti-siphon valve and two fittings to connect it to the existing lines. Replacements for the OEM valve run from around $25 to $50. You can get a brass replacement for around $10.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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