Valterra RV Flush King 45° Reverse Flush Valve Attachment — Clear Chamber, Anti-Siphon Backflow Protection

The Valterra Flush King™ 45 Degree Reverse Flush Valve Attachment is a compact RV sewer rinsing tool that flushes and breaks up solids while rinsing tank, valve and hose in a single, leak-resistant operation.

Designed for campers, trailers and motorhomes, this reverse flush attachment connects to standard RV sewer fittings and redirects city water into the waste system to loosen buildup and rinse interior surfaces. Its clear body lets you watch the water run until it clears, and an internal anti-siphon/backflow device guards your potable water supply. Paired with bayonet-style connections and a 45° angle, the unit is built to stay secure and make draining simpler and faster so you can spend less time on maintenance and more time on the road.

How does this valve attachment improve RV dumping and cleaning?

Instead of only relying on gravity, the Flush King™ introduces pressurized water into the sewer line to agitate and dissolve accumulated solids and residue. The angled flow and spray pattern target tank walls and the valve area to dislodge material so it can exit through the hose.

• Pressurized back-flush action helps break up clogs and compacted debris.
• Rinses tank interior, gate valve and drain hose in one operation.
• Clear chamber lets you monitor water clarity while flushing.

What safety features protect my RV's fresh water supply?

The attachment includes an anti-siphon design with an internal backflow preventer to stop wastewater from being drawn into the potable water system. This creates a safer hookup when using campground water pressure to flush tanks.

• Built-in anti-siphon valve reduces backflow risk.
• Internal backflow preventer meets common RV safety expectations.
• Bayonet fittings maintain a sealed connection during pressurized use.

Will it fit my RV sewer setup and how easy is it to connect?

The Flush King™ uses universal bayonet-style fittings and a 360° swivel to work with standard RV sewer connectors, giving a tight, leak-resistant join with minimal alignment fuss. The 45° angle helps align awkward hookups and promotes a more direct spray into the tank opening.

• Universal bayonet fittings for broad compatibility.
• 360° swivel for easier positioning and reduced stress on hoses.
• Pre-installed fittings speed up setup at the dump station.

How will I know when the tank is fully rinsed?

The clear construction of the attachment gives a visible indicator of incoming water and runoff. As you flush, you can watch the discharge until it runs clear, which signals a more complete rinse compared with guessing based on odor or time alone.

• Transparent walls show when rinse water clears.
• Visual confirmation reduces repeat flushing and water waste.
• Clearing observation helps prevent missed clogs or lingering residue.

Who is this for: The Valterra Flush King™ 45 Degree Reverse Flush Valve Attachment is intended for RV owners, seasonal campers, rental fleets and maintenance personnel who want a dependable, visible method to blast and rinse black/gray tanks, valves and hoses. It suits anyone seeking faster, cleaner dump-station procedures with safer backflow protection and an easy-to-use, universal connection. If you prefer an efficient flush that reduces manual scrubbing and repeated trips to the dump area, this accessory is a practical addition to your RV toolkit.