8558307 WP8558307 Dishwasher Rinse Aid Dispenser Cap

Key Features

• High-Temperature Structural Polymer: Manufactured from a specialized, heat-stabilized plastic designed to withstand the intense thermal stress of "Sani-Rinse" and "Heated Dry" cycles without warping or becoming brittle.
• Integrated EPDM Rubber Seal: Features a high-performance internal rubber gasket that creates an airtight and watertight seal, preventing rinse aid from leaking into the tub prematurely or water from diluting the reservoir.
• Precision Twist-Lock Interface: Engineered with a standardized locking tab system that provides a secure, friction-lock fit with the dispenser housing, ensuring the cap remains seated during high-pressure wash cycles.
• Ergonomic Finger-Grip Tab: Designed with a raised central rib that makes it easy to grasp and turn, even with wet hands or when wearing rubber cleaning gloves.

Replaces / Cross-Reference Part Numbers

• Primary Parts: 8558307, WP8558307, WP8558307VP.
• Industry Standards: AP6013204, PS11746426.
• Legacy Cross-Reference: 8193984, 8539095.

Compatibility & Fitment

This dispenser cap is the standard replacement for the rinse aid reservoir of most Whirlpool-manufactured dishwashers. Key compatible brands include:

• Whirlpool & Maytag: Fits hundreds of WDT, WDF, and MDB series models (e.g., WDT720PADM, MDB4949SHZ).
• Kenmore (665 Series): Compatible with dozens of 665-prefix "Elite" and standard dishwashers (e.g., 665.13263K311, 665.1573291).
• KitchenAid & Jenn-Air: Fits various KDTM, KDTE, and JDT series high-end units (e.g., KDTE104ESS, KUDC10FXSS).
• Amana, Roper, & Estate: Direct fit for ADB and DU series models utilizing the 8558307 cap style.
• Note: Specifically for the Rinse Aid Reservoir located on the inner door panel. It is not for the detergent door latch or the bottom sump filters.

When to Replace

• Rinse Aid Leaking: You see blue or clear liquid streaks running down the inner door panel after closing the door, indicating the gasket has flattened or cracked.
• Cap Won't Stay Locked: The plastic locking tabs have snapped or worn down, causing the cap to pop out during the wash cycle.
• Cloudy Glassware: If the cap is loose, the rinse aid may be washed away too early in the cycle, leading to spots, film, and poor drying results on your dishes.
• Visible Heat Damage: The cap looks yellowed, brittle, or deformed after years of exposure to the dishwasher's heating element.
• Missing Cap: The original cap was lost or accidentally thrown away, leaving the reservoir open to water dilution and contamination.

Installation Tips

• No Tools Required: This is a simple "twist and lock" replacement. Ensure the dishwasher is off and the inner door panel is dry.
• Clean the Reservoir Opening: Before installing the new WP8558307 cap, use a damp cloth to wipe away any old rinse aid residue or mineral scale from the threads of the dispenser housing.
• Check the Gasket: Ensure the black rubber gasket is seated flat against the underside of the new cap. If the gasket is twisted, the reservoir will leak.
• The "Quarter-Turn" Lock: Insert the cap into the opening and turn it clockwise until it stops. It should feel snug and flush with the dispenser housing. Do not over-tighten, as the plastic tabs can snap.
• Top-Off the Reservoir: This is the ideal time to refill your rinse aid. Filling the reservoir before locking the new cap ensures your next wash cycle will have the correct dosage for spot-free drying.