108-910A LEGEND 10” T-550A CARTRIDGE & STEM ASSEMBLY
Fits Improved Flow 10” Frost-Free T-550A Sillcock
Repair your Legend T-550A frost-free sillcock quickly and easily with the 108-910A cartridge and stem assembly. Designed for the Improved Flow version, this replacement restores smooth operation, prevents leaks, and ensures long-lasting performance.
✅ Key Features
✅ Fits 10” Legend T-550A Improved Flow Frost-Free Sillcock
✅ Cartridge length: 13-3/4" (without handle) / 14-1/2" (with handle)
✅ Sillcock length: 10"
✅ 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 Pat. 5.392.805 D527.797
✅ Precision-fit stem and seal for long-lasting performance
⚠️ Note: The 108-910AR (Original T-550) differs: silver disc with black lettering, dual O-rings, and a tapered inlet with six wrench flats. Always confirm your sillcock model before ordering.
📊 Specifications Table
| Specification | Detail |
|---|
| Model |
108-910A |
| Fits |
Legend T-550A Improved Flow 10” Frost-Free Sillcock |
| Sillcock Length |
10" |
| Cartridge Length Without Handle |
13-3/4" |
| Cartridge Length With Handle |
14-1/2" |
| Disc Color / ID |
Black disc with Silver LEGEND lettering |
| Patent Marking |
Pat. 5.392.805 D527.797 |
| Inlet Connection |
Straight, Round Knurled Wrench Pad |
| Design Type |
Improved Flow |
| O-Rings |
1 |
| End Tabs |
2 |
🔍 Identification Guide
Step 1: Check the Handle Identification Disc
| Feature | 108-910A (T-550A Improved Flow) | 108-910AR (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: Silver disc with black letters → T-550 Original / Retrofit
Black disc with silver letters → T-550A Improved Flow
Step 2: Check Handle Inlet Style
| Feature | 108-910A | 108-910AR |
|---|
| Inlet |
Straight, round knurled pad |
Tapered, six wrench flats |
Step 3: Measure the Cartridge
| Model | Without Handle | With Handle | Sillcock Length |
|---|
| 108-910A |
13-3/4" |
14-1/2" |
10" |
| 108-910AR |
13-5/8" |
14-1/2" |
10" |
⚠️ Final Check Before Ordering
✅ Order 108-910A (T-550A Improved Flow) if:
-
Handle disc is black with silver LEGEND lettering
-
Inlet connection is straight knurled pad
-
Cartridge measures 13-3/4" without handle / 14-1/2" with handle
-
Sillcock length is 10"
-
Patent marking is Pat. 5.392.805 D527.797
✅ Order 108-910AR (T-550 Original / Retrofit) if:
-
Handle disc is silver with black LEGEND lettering
-
Inlet connection is tapered with six wrench flats
-
Cartridge measures 13-5/8" without handle / 14-1/2" with handle
-
Sillcock length is 10"
-
Patent marking shows Pat. Pend.
🔧 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 your 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.
❓ FAQ
Q: How do I know if I need 108-910A or 108-910AR?
A: Use the Quick Tip: Silver disc with black letters → T-550 Original / Retrofit. Black disc with silver letters → T-550A Improved Flow. Also check inlet style and cartridge length.
Q: Can I install this myself?
A: Yes — designed for easy DIY replacement using standard tools.
Q: Is 108-910A interchangeable with 108-910AR?
A: No — 108-910A only fits Improved Flow T-550A 10” frost-free sillcocks.
