

Part 550-448 is a replacement gun head for the Airless LX-70 Inline Gun. The gun head serves as the forward housing that contains the fluid passage, valve assembly, and tip connection components. When the gun head becomes worn, damaged, or develops leaks at the fluid passages, replacing this component restores proper fluid flow control, consistent spray pattern performance, and reliable operation of the spray gun assembly.
| Part Number | 550-448 |
|---|---|
| Part Description | Gun Head |
| Brand | SprayTech |
| Fits | Airless LX-70 Inline Gun |
| Condition | New |
Part 550-448 is a replacement gun head specifically designed for the Airless LX-70 Inline Gun. The gun head represents the forward section of the spray gun assembly, housing the critical internal fluid passages that direct coating material from the gun body to the spray tip. Within the gun head, the fluid path is precisely machined to maintain consistent flow characteristics and minimize pressure loss as material travels toward the tip. The gun head also provides the mounting interface for the tip guard, spray tip, and seal components that together determine spray pattern quality and fan width. During normal use, the gun head is subjected to the full operating pressure of the spray system, which can reach several thousand pounds per square inch in airless applications. Over extended service, the internal fluid passages may become eroded by abrasive coating materials, or the threads that secure the tip guard and retaining components may become worn or damaged. Physical impact can also cause distortion or cracking of the gun head housing, compromising its ability to maintain a leak-free seal. Common symptoms indicating gun head replacement include visible fluid leaks originating from the forward section of the gun, difficulty achieving a consistent spray pattern despite tip replacement, cross-threading or inability to securely mount tip components, or external damage to the housing that affects structural integrity. Replacing the gun head restores the original fluid pathway geometry, proper tip mounting, and leak-free operation essential for professional spray application results.
| Fluid passage | Houses precision-machined internal channels that direct coating material from the gun body to the spray tip |
|---|---|
| Tip mounting interface | Provides the threaded or retained connection point for tip guard, spray tip, and sealing components |
| Pressure containment | Withstands full system operating pressure while maintaining leak-free integrity at all connections |
| Visible leakage | Fluid seeps from the forward section of the gun during operation |
|---|---|
| Damaged threads | Cross-threaded, stripped, or worn threads that prevent secure tip guard or tip mounting |
| Inconsistent pattern | Spray pattern defects that persist after tip replacement and proper pressure adjustment |
| Physical damage | Cracks, deformation, or impact damage that compromises structural integrity or sealing surfaces |
Part 550-448 is compatible with the Airless LX-70 Inline Gun. Confirm fitment by verifying the gun head matches the original configuration for your specific gun revision.
| Equipment Model | Component |
|---|---|
| Airless LX-70 Inline Gun | Gun head assembly |
When replacing the gun head or addressing gun performance issues, these components are frequently inspected or replaced at the same time.
Seals between the gun body and gun head prevent fluid leakage; replacement ensures a leak-free connection when installing a new gun head.
The tip guard protects the spray tip; damaged retaining components should be replaced to ensure secure tip mounting.
The spray tip determines fan pattern and flow rate; the tip seal prevents bypass leakage around the tip assembly.