108-904AR LEGEND 4” T-550 CARTRIDGE & STEM ASSEMBLY

Fits Original 4” Frost-Free T-550 Sillcock

Repair your outdoor faucet quickly with the Legend 108-904AR replacement cartridge. Designed for the original T-550 sillcock, this retro-fit cartridge offers reliable performance with a one-piece stem and cartridge design for easier installation.

✅ Key Features

✅ Direct OEM replacement for Legend T-550 Original 4” Frost-Free Sillcock
✅ Cartridge length: 7-5/8" (without handle) / 8-1/2" (with handle)
✅ Retro-fit design: one-piece stem and cartridge
✅ Dual O-ring seal for a secure fit (no end tabs)
✅ Easy identification: silver disc with black LEGEND lettering (Pat. Pend.)
✅ Tapered inlet connection with six wrench flats
✅ Quick visual tip: If your cartridge has one O-ring and two tabs → likely need 108-904A

📊 Specifications Table

🔁 Cross Reference Table

🔍 Step-by-Step Identification Guide

Step 1: Check the Handle Identification Disc

✅ Quick Tip: Silver disc with black letters → T-550 Original / Retrofit
Black disc with silver letters → T-550A Improved Flow

Step 2: Check Handle Inlet Style (Quick Visual)

🧠 Tip: Tapered inlet with six wrench flats → T-550 Original

Step 3: Measure the Cartridge

🧭 Combine handle disc, inlet style, and cartridge length for definitive ID.

🧩 Quick Reference Comparison

⚠️ Final Check Before Ordering

✅ Order 108-904AR if:

• Handle disc is silver with black lettering and Pat. Pend.

• Inlet connection is tapered with six wrench flats

• Cartridge measures 7-5/8" (without handle) / 8-1/2" (with handle)

✅ Order 108-904A if:

• Handle disc is black with silver lettering and Patent 5.392.805 D527.797

• Inlet connection is straight with round knurled pad

• Cartridge measures 7-3/4" (without handle) / 8-1/2" (with handle)

🔧 Common Problems This Fixes

• Leaking or dripping frost-free sillcocks

• Handle difficult to turn or poor water flow

• Worn internal seals or O-rings

• Corroded or damaged cartridge connection

🛠️ Installation Overview

1. Turn off water supply.

2. Remove existing stem assembly.

3. Identify model using handle disc, inlet style, and cartridge measurement.

4. Install replacement cartridge (apply plumber’s grease to O-rings).

5. Reassemble handle and test for smooth operation.

🛒 Shopping Tips

• Check handle disc color, lettering, and patent markings.

• Verify inlet connection style (tapered six flats vs. straight knurled pad).

• Keep a wrench and plumber’s grease handy for installation.

❓ FAQ – Frequently Asked Questions

Q: What sillcock does the Legend 108-904AR fit?
A: It’s designed for the Original 4” T-550 Frost-Free sillcock.

Q: How do I know if I need the 108-904AR or 108-904A?
A: The 108-904AR has two O-rings and no tabs. The 108-904A has one O-ring and two tabs.

Q: What’s the difference between the original and retro-fit cartridges?
A: The original T-550 had a detachable cartridge. The retro-fit 108-904AR combines stem and cartridge into one solid piece for easier installation.