Valterra RV Flush King 45° Reverse Flush Valve Attachment — Clear Bayonet Rinse with Anti-Siphon & 360° Swivel

Designed for campers, trailers, and motorhomes, this 45-degree reverse flush valve speeds up black- and gray-water maintenance by directing a strong rinse through the tank and hose while preventing backflow into your fresh-water system. Its clear construction makes it easy to monitor the rinse until the water runs clear, and bayonet fittings deliver a tight, leak-resistant connection with full swivel for convenient positioning.

How does the reverse flush action make tank cleaning easier?

The Flush King™ reverses flow to send pressurized water up through the tank and plumbing, loosening buildup and flushing solids toward the outlet. That action reduces the need for manual scrubbing and shortens the overall maintenance time.

• Directs water into tank interior to break up deposits and clogs
• Rinses valve, hose, and pipework in a single operation
• Clear walls let you see when rinse water runs clean

Will this attachment protect my fresh-water supply?

Yes — the unit includes an anti-siphon internal valve that helps prevent backflow into the potable water line, reducing cross-contamination risk during flushing. It’s a passive, mechanical safeguard built into the fitting.

• Internal backflow preventer limits siphon-induced contamination
• Operates automatically during rinse use, no extra parts required
• Compatible with standard RV city-water connections for easy hookup

Is the connection reliable and easy to handle at campsites?

Valterra designed the Flush King™ with bayonet-style fittings and a 360° swivel to create a secure, leak-resistant joint that’s simple to attach and adjust. The 45-degree shape and swivel action make it easier to position the hose and keep connections tight on uneven ground or cramped service bays.

• Bayonet fittings provide a tight seal to minimize leaks
• 360-degree swivel prevents hose kinking and eases alignment
• 45° angle improves access to RV outlets in tight spaces

What maintenance or compatibility should I expect?

The Flush King™ is made for universal RV fitments and requires minimal upkeep: rinse and inspect the clear housing and fittings after use, and store dry. Because it uses common bayonet and threaded interfaces, it fits most standard RV sewer setups without adapters.

• Clear construction simplifies visual inspection and cleaning
• Universal-fit approach works with most RV and trailer drain systems
• Store dry and check bayonet seals periodically for wear

Who is this for? The Valterra Flush King™ 45° Reverse Flush Valve is ideal for RV owners, seasonal campers, and maintenance technicians who want a faster, cleaner way to flush black- and gray-water tanks and hoses. If you value a leak-resistant connection, visible rinse confirmation, and built-in anti-siphon protection, this attachment streamlines routine tank care so you can spend less time on maintenance and more time on the road.