108-906A LEGEND 6” T-550A CARTRIDGE & STEM ASSEMBLY
Fits Improved Flow 6” Frost-Free T-550A Sillcock
Repair your Legend T-550A frost-free sillcock quickly with the 108-906A cartridge and stem assembly. Designed for the Improved Flow version, this replacement restores smooth operation and eliminates leaks or drips.
✅ Key Features
✅ Direct OEM replacement for Legend T-550A Improved Flow 6” Frost-Free Sillcock
✅ Cartridge length: 9-3/4" (without handle) / 10-1/2" (with handle)
✅ Durable construction with one O-ring + two alignment tabs
✅ Straight inlet connection with round knurled wrench pad
✅ Easy identification: black disc with silver LEGEND lettering, patent marking Pat. 5.392.805 D527.797
✅ Precision-fit stem and seal for long-lasting performance
📊 Specifications Table
| Specification | Detail |
|---|
| Model |
108-906A |
| Fits |
Legend T-550A Improved Flow 6” Frost-Free Sillcock |
| Cartridge Length |
9-3/4" (without handle) / 10-1/2" (with handle) |
| Disc Color / ID |
Black disc with Silver LEGEND lettering |
| Patent Marking |
Pat. 5.392.805 D527.797 |
| Inlet Connection |
Straight, round knurled pad |
| Design Type |
Improved Flow |
| O-Rings |
1 |
| End Tabs |
2 |
🔁 Cross Reference Table
| Sillcock Model | Cartridge / Stem Assembly | Identification Details |
|---|
| T-550A (Improved Flow) |
108-906A |
Black/Silver ID Disc • Pat. 5.392.805 D527.797 • Straight inlet with round knurled pad |
| T-550 (Original / Retrofit) |
108-906AR |
Silver/Black ID Disc • Pat. Pend. • Tapered inlet with six wrench flats |
🔍 Step-by-Step Identification Guide
Step 1: Check the Handle Identification Disc
| Feature | T-550A (Improved Flow) | T-550 (Original / Retrofit) |
|---|
| Disc Color |
Black |
Silver |
| Lettering Color |
Silver LEGEND |
Black LEGEND |
| Patent Marking |
Pat. 5.392.805 D527.797 |
Pat. Pend. |
✅ Quick Tip: Black disc with silver letters → T-550A Improved Flow
Silver disc with black letters → T-550 Original / Retrofit
Step 2: Check Handle Inlet Style (Quick Visual)
| Feature | T-550A (108-906A) | T-550 (108-906AR) |
|---|
| Handle Inlet |
Straight, round knurled pad |
Tapered, six wrench flats |
🧠 Tip: Straight inlet with round knurled pad → T-550A
Tapered inlet with six wrench flats → T-550
Step 3: Measure the Cartridge
| Model | Without Handle | With Handle |
|---|
| 108-906A (T-550A) |
9-3/4" |
10-1/2" |
| 108-906AR (T-550) |
9-5/8" |
10-1/2" |
🧭 Combine handle disc, inlet style, and cartridge length for definitive ID.
🧩 Quick Reference Comparison
| Feature | T-550A (Improved Flow) | T-550 (Original / Retrofit) |
|---|
| Cartridge Part No. |
108-906A |
108-906AR |
| Handle Disc |
Black / Silver Lettering |
Silver / Black Lettering |
| Patent Marking |
Pat. 5.392.805 D527.797 |
Pat. Pend. |
| Handle Inlet |
Straight, Round Knurled Pad |
Tapered, Six Wrench Flats |
| Seal Design |
1 O-ring + 2 Tabs |
2 O-rings, no tabs |
| Stem Design |
Two-piece assembly |
One-piece assembly |
| Flow Type |
Improved Flow |
Original Flow |
⚠️ Final Check Before Ordering
✅ Order 108-906A if:
-
Handle disc is black with silver lettering and patent marking Pat. 5.392.805 D527.797
-
Inlet connection is straight with round knurled pad
-
Cartridge measures 9-3/4" (without handle) / 10-1/2" (with handle)
✅ Order 108-906AR if:
-
Handle disc is silver with black lettering and Pat. Pend.
-
Inlet connection is tapered with six wrench flats
-
Cartridge measures 9-5/8" (without handle) / 10-1/2" (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
-
Turn off water supply.
-
Remove existing stem assembly.
-
Identify model using handle disc, inlet style, and cartridge measurement.
-
Install replacement cartridge (apply plumber’s grease to O-rings).
-
Reassemble handle and test for smooth operation.
🛒 Shopping Tips
-
Check handle disc color, lettering, and patent markings.
-
Verify inlet connection style (straight knurled pad vs. tapered six flats).
-
Keep a wrench and plumber’s grease handy for installation.
❓ FAQ – Frequently Asked Questions
Q: What sillcock does the Legend 108-906A fit?
A: It’s designed for the Improved Flow 6” T-550A Frost-Free sillcock.
Q: How do I know if I need the 108-906A or 108-906AR?
A: The 108-906A has one O-ring + two tabs. The 108-906AR has two O-rings and no tabs.
Q: What’s the difference between the Improved Flow and Original cartridges?
A: Improved Flow T-550A cartridges have a two-piece assembly with one O-ring + two tabs. Original T-550 cartridges are one-piece with two O-rings and no tabs.
