iouxvt Washer Vacuum Break WP3360977 Replacement - Whirlpool OEM-Style Anti-Siphon, 6.85" Length

The iouxvt WP3360977 is a direct-replacement washer vacuum break (water inlet siphon) designed to stop backflow and keep your washer's water supply clean and functioning.

If your clothes washer is exhibiting water-siphoning issues, unusual drain-back after cycles, or you simply need to replace a worn inlet assembly, the WP3360977 is an OEM-style aftermarket vacuum break that restores the anti-siphon protection in compatible Whirlpool models. This component replaces several common part numbers (3360977, 387606, 2845, PS11741230, AP6008099, AP3096264, PS342081, EA342081, EA11741230) and measures approximately 6.85" long, 5.87" wide, and 3.15" high. It does not replace part 3347034.

How does the WP3360977 prevent dirty water from flowing back into my home supply?

The vacuum break is an anti-siphon device that breaks negative pressure in the inlet line, stopping contaminated water from being drawn back into the clean water plumbing. It protects hygiene and reduces the risk of cross‑contamination between the washer and household water.

• Creates an air gap to interrupt siphoning.
• Fits directly into the washer water inlet assembly.
• Works passively—no power required for operation.

Which washer models and part numbers is this compatible with?

This replacement is compatible with a wide range of Whirlpool models and replaces many equivalent part numbers—but it does not replace 3347034. Always compare dimensions and connectors before purchasing to be certain of fit.

• Compatible with listed Whirlpool model series (e.g., 7MWT, 7MWW, LA5580, LA9100).
• Replaces 3360977 and several cross-reference numbers noted above.
• Check the washer control panel access and inlet shape to confirm match.

What should I know about installing the vacuum break?

Installation is straightforward for someone comfortable with appliance repair, but always disconnect power and water before starting. Removing the control panel and cabinet gives access to the inlet; unplug connectors and swap the old unit for the new one, then reassemble in reverse order.

• Turn off power and water supply first to avoid shock or flooding.
• Remove control panel screws, disconnect wire harnesses, and open cabinet.
• Swap the inlet siphon, reconnect wiring, and reassemble securely.

What performance and reliability benefits can I expect?

Replacing a faulty vacuum break restores the anti‑siphon function so the washer maintains proper fill and drain behavior. This reduces odors, prevents contamination risk, and helps the appliance operate as intended over time.

• Restores correct inlet pressure and fill behavior.
• Helps prevent backflow of soiled water into clean lines.
• Durable construction to match original equipment form and fit.

Who is this for: The iouxvt WP3360977 vacuum break is intended for homeowners, appliance technicians, and maintenance professionals replacing the inlet siphon in compatible Whirlpool washers. Choose this part if you need a reliable aftermarket replacement to resolve siphoning, restore proper water fill operation, or replace a worn or damaged inlet assembly. If you’re unsure about fitment or need guidance, contact the seller or consult your washer’s service manual before installation.