Graco 113121 Ball Valve
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The Graco 113121 Ball Valve is a durable 1″ brass valve used on Graco texture spray systems for reliable air/bleed control.
- Genuine OEM part #113121
- 1″ brass construction for long service life
- Used on TexSpray EXT HP & Twin-Tank systems
- Ensures smooth airflow and proper gun operation
- Simple, leak-free on/off control
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Graco 113121 Valve – Ball
The Graco 113121 is a genuine OEM **1″ brass ball valve**, designed for use in Graco texture sprayer systems. It provides reliable **on/off flow control** and is commonly used on the air/bleed path of the gun.
Compatible Machines
- Graco **TexSpray EXT HP Texture Sprayer** (Flex-head / pole-gun) — listed in the 308603 parts manual.
- Graco **TexSpray Twin Tank (EXT)** systems — identified in the EXT HP / Twin-Tank manual.
Key Features & Specifications
| Part Number | 113121 |
| Type | 1″ Brass Ball Valve |
| Weight | ~1.265 lb (≈ 0.576 kg) |
| Dimensions | Approx. 4.1″ × 2.95″ × 0.89″ |
| Function | Gun air / bleed valve (open to allow bleeding, close to stop air) |
Why Use This Valve?
- Engineered specifically for Graco texture guns (EXT HP and Twin-Tank systems)
- Sturdy brass construction for durability under high pressure and repeated use
- Provides smooth operation for controlling airflow at the gun
- Replaces worn or leaking ball valves to restore proper gun function
Installation Notes
- Always relieve system pressure before servicing or removing the valve (follow manufacturer’s pressure-relief procedure).
- Thread sealant may be required (depending on the model) to ensure a tight, leak-free connection.
- Inspect the lever alignment: make sure the ball opening is aligned with flow direction during installation.
Where to Buy
You can find the Graco 113121 ball valve from several reliable suppliers, such as Pittsburgh Spray Equipment (unit weight ~ 1.27 lbs).
Frequently Asked Questions
The 113121 valve is the **gun air ball valve** — it controls whether air is bled from the gun. When open, it allows air to escape, which helps with priming. When closed, it stops air flow so the gun can spray properly.
Based on the available documentation, the 113121 valve is specified for **TexSpray EXT HP** and **Twin-Tank EXT** gun systems, not for RTX series guns.
Yes. To service the valve:
- Relieve all system pressure first, following proper procedure.
- Disassemble carefully; inspect the ball, seats, and O-rings for wear.
- Lubricate O-rings with a compatible lubricant and reassemble, aligning the ball hole with the handle lever.
When replacing the valve, make sure that:
- The **part number** matches (113121).
- The **dimensions** (1″ port, brass body) fit your gun's model.
- You follow the **pressure-relief procedure** to avoid injuries.
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