iouxvt WP3360977 Washer Vacuum Break Replacement Siphon for Whirlpool - OEM Fit, Anti-Siphon

The iouxvt WP3360977 Vacuum Break is a direct replacement washer water-inlet siphon that prevents backflow and restores proper fill and drainage function in compatible Whirlpool machines.

If your washing machine is showing signs of slow filling, occasional backflow, or you need to replace a damaged inlet siphon, the WP3360977 offers a ready-made OEM-style swap. Designed to match part numbers 3360977, 387606, 2845, PS11741230, AP6008099, AP3096264, PS342081, EA342081 and EA11741230 (note: it does not replace 3347034), this vacuum break installs in the tub fill/nozzle assembly to protect your clean water supply from siphoning of dirty water. The component measures approximately 6.85 inches long, 5.87 inches wide and 3.15 inches high and is intended for a range of Whirlpool model numbers listed below.

How does this vacuum break stop water from siphoning back into the supply?

The vacuum break acts as an anti-siphon barrier between the washer’s drain and the household water lines. When a negative pressure event occurs, the break allows air into the drain path so contaminated water cannot be pulled back toward the inlet. This simple mechanical function preserves water hygiene without electronics or software.

• Contains a one-way air path that opens under vacuum conditions.
• Sits at the tub fill/nozzle to separate drain flow from incoming water.
• No external power required; passive mechanical protection.

Will the WP3360977 fit my Whirlpool model?

This replacement part is compatible with many Whirlpool top-load and select models, making it useful for common machine families. Check the model list below against your appliance to confirm fit before ordering. If your washer’s manual lists any of the referenced part numbers (3360977, 387606, etc.), this WP3360977 is likely a correct match.

• Fits numerous Whirlpool models including 7MWW87620SM0 and 7MWT98950TW0.
• Also compatible with LA5580XSF1, LA5580XSG2, LA5580XSM3 and similar codes.
• Not compatible with part number 3347034—verify part number on your old siphon.

How difficult is it to install and what tools are needed?

Installation is straightforward for anyone comfortable accessing a washer’s control panel and inlet area. Basic hand tools and careful disconnection of power and water are required. Follow safety steps to disconnect electricity and water before beginning, then remove screws, detach connectors, replace the old siphon, and reassemble.

• Suggested tools: screwdriver set, needle-nose pliers, and a towel for any residual water.
• Typical steps: power off, remove control panel screws, disconnect connector, swap the vacuum break, reassemble.
• Allow 20–45 minutes for a routine replacement if you have basic DIY experience.

What performance improvements should I expect after replacing it?

Replacing a worn or cracked vacuum break reduces the risk of backflow and restores reliable water fill behavior. You may notice more consistent fill cycles and elimination of occasional dirty water odors caused by cross-contamination. The part helps the washer maintain correct water routing during wash and drain phases.

• Restores anti-siphoning protection for clean water supply lines.
• Helps prevent occasional slow or uneven filling linked to a failing break.
• Contributes to longer overall appliance reliability when combined with routine maintenance.

Who is this for: The iouxvt WP3360977 Vacuum Break is intended for homeowners, repair technicians, and appliance service shops needing an exact-fit replacement for compatible Whirlpool washers. It’s best for anyone replacing a cracked, clogged, or malfunctioning inlet siphon who wants a straightforward, mechanical solution to prevent backflow. If you’re unsure about fit, compare the old part number or consult a technician—our support team is also available to answer compatibility questions.