756-034 is a gun clamp knob used to secure the spray gun to the clamp or holder on compatible Airless Side Striper, PowrLiner, and ProMark II airless sprayers. It replaces a worn, stripped, or missing knob to ensure the gun is held firmly during transport and storage.
| Part Number | 756-034 |
|---|---|
| Part Description | Gun Clamp Knob |
| Brand | Airless / PowrLiner / ProMark |
| Fits | Airless Side Striper: Model No 759-150 PowrLiner: 3500 72v, 3500, 3500s, 4500, 2850, 5500, 3100, 4955, 6955, 8955, 550, 4000, 2800, 4900XLT, 4900, 5000, 1800M, 2800M, 6000, 6900XLT SP, 800, 6900XLT, 8900 XLT SP, 8900XLT, 8900, 4950, 6950 ProMark II: Model No 759-2010 |
| Condition | New |
The 756-034 Gun Clamp Knob is an OEM replacement knob used to tighten and secure the spray gun into the gun clamp or holder on a wide range of airless sprayers. This knob is typically mounted on a threaded stud and is turned by hand to lock the gun in place for transport, storage, or when not in use. A properly secured gun prevents damage to the gun, hose, and trigger.
Over time, the knob can become stripped, cracked, or lost. A missing or damaged knob allows the gun to flop around, increasing the risk of hose kinking, tip damage, or accidental triggering. Replacing it with the 756‑034 restores a secure, convenient gun retention system.
| Secures spray gun | Locks the gun into the clamp/holder to prevent movement |
|---|---|
| Protects gun & hose | Prevents kinking, dragging, and accidental drops |
| Convenient storage | Allows quick release and secure stowing of the gun |
| Stripped threads | Knob spins without tightening or will not stay tight |
|---|---|
| Cracked or broken knob | Knob body is split or missing pieces |
| Missing knob | Knob lost during transport or operation |
| Difficult to turn | Excessive force needed due to deformation or debris |
Part 756-034 is compatible with the following models. Always verify with your machine's parts diagram before ordering.
| Brand / Model | Component |
|---|---|
| Airless Side Striper 759-150 | Gun clamp knob |
| PowrLiner 3500 72v | Gun clamp knob |
| PowrLiner 3500 | Gun clamp knob |
| PowrLiner 3500s | Gun clamp knob |
| PowrLiner 4500 | Gun clamp knob |
| PowrLiner 2850 | Gun clamp knob |
| PowrLiner 5500 | Gun clamp knob |
| PowrLiner 3100 | Gun clamp knob |
| PowrLiner 4955 | Gun clamp knob |
| PowrLiner 6955 | Gun clamp knob |
| PowrLiner 8955 | Gun clamp knob |
| PowrLiner 550 | Gun clamp knob |
| PowrLiner 4000 | Gun clamp knob |
| PowrLiner 2800 | Gun clamp knob |
| PowrLiner 4900XLT | Gun clamp knob |
| PowrLiner 4900 | Gun clamp knob |
| PowrLiner 5000 | Gun clamp knob |
| PowrLiner 1800M | Gun clamp knob |
| PowrLiner 2800M | Gun clamp knob |
| PowrLiner 6000 | Gun clamp knob |
| PowrLiner 6900XLT SP | Gun clamp knob |
| PowrLiner 800 | Gun clamp knob |
| PowrLiner 6900XLT | Gun clamp knob |
| PowrLiner 8900 XLT SP | Gun clamp knob |
| PowrLiner 8900XLT | Gun clamp knob |
| PowrLiner 8900 | Gun clamp knob |
| PowrLiner 4950 | Gun clamp knob |
| PowrLiner 6950 | Gun clamp knob |
| ProMark II 759-2010 | Gun clamp knob |
When replacing the gun clamp knob, these related components are often inspected or replaced at the same time.
Check the clamp bracket for cracks or deformation.
Inspect stud threads; replace if damaged or bent.
Ensure the gun handle is not worn where the clamp contacts it.
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