Refrigerator Water Line Leaking or Loose? Tube Coupler W11578570 – Fix Tube Connection Fast

If your Whirlpool, Maytag, or Amana refrigerator has a water leak at the tubing connection, is dripping inside the cabinet, or the water dispenser has lost pressure, a failed lockring tube coupler is the most common cause. In most Whirlpool-built refrigerators, the lockring tube coupler creates the sealed connection between the 7mm and 4.5mm water supply lines running to the dispenser and ice maker. When it fails, the lockring loses its grip on the tubing — allowing water to seep past the fitting, drip into the cabinet, or cause a complete loss of dispenser flow. ⚡ Common failure point in Whirlpool-platform refrigerators with push-fit tube connections. Part W11578570 is the genuine OEM brass reducer coupler that restores a secure, leak-free tube connection — directly superseding W11574641 with no modification required.

❓ Is This the Right Part?

This is the correct fix if ALL of the following are true:

• ✔ Refrigerator powers on and cooling system operates normally
• ✔ Water supply valve and inlet line confirmed functional and pressurized
• ✔ Ice maker and dispenser controls respond correctly
• ✔ No visible damage to the water supply tubing itself
• ✔ ONLY problem is a leak, drip, or pressure loss at the tube fitting connection point

Not sure? Send us your model number — we'll confirm before you order.

🔧 Common Symptoms

• Water dripping or pooling inside the refrigerator cabinet — most common customer complaint
• Water dispenser has reduced flow or no flow at all
• Ice maker producing less ice or stopping production entirely
• Visible moisture or mineral deposits around the tube fitting
• Tubing pulls free from the fitting with little or no resistance
• Intermittent water flow — works sometimes, stops randomly

✔ If these symptoms match, the lockring tube coupler is the most likely failed component in the water supply path.

✔ In most cases, replacing this coupler restores full water pressure and stops the leak immediately.

📦 Part Details

• Part Number: W11578570
• Type: Refrigerator lockring tube coupler — 7mm to 4.5mm brass reducer, push-fit design for OEM water supply tubing
• Replaces: OEM direct-fit tube coupler — supersedes W11574641 (no modification required)
• Brands: Whirlpool, Maytag, Amana

⚙️ Installation

Skill Level: EASY — 10 to 15 minutes. Shut off the water supply valve before disconnecting any tubing. Press the collar on the existing fitting to release the tube, remove the old coupler, and press the new W11578570 into position until it clicks and locks. Reinsert the tubing firmly until it bottoms out in the fitting — give it a gentle tug to confirm the lockring has engaged before restoring water pressure. Do not overtighten or force the fitting — the lockring seats by hand pressure only.

💡 Pro Tip

Compatible model pages: AZF33X16DW08, AZF33X18DW06, AZF33X20DW06, MFB2055FRZ02, MFF2055FRZ03, MRT311FFFE01, MRT311FFFZ01, MZF34X18FW06, MZF34X20DW06, WRT311FZDB02, WRT311FZDT02, WSZ57L18DM06, WSZ57L18DM07, WZF34X16DW08, WZF34X16DW09, WZF34X18DW06, WZF34X18DW07, WZF34X20DW04, WZF34X20DW05, WZF56R16DW08, WZF56R16DW09, WZF57R16FW08, WZF57R16FW09, WZF79R20DW06, WZF79R20DW07

✓ Model-Specific Repair Pages