Graco 104126 Boss Plug
$37.52
$39.70
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Graco 104126 Boss Plug—a hex-head sealing plug with 3/4-16 UNF threads used to close boss ports on Graco filter/manifold assemblies and select diaphragm-pump systems. Verify your parts list before ordering.
- Thread: 3/4-16 UNF (fine)
- Typical Use: Seal unused/service boss ports on high-pressure filter modules
- Fit Check: Match thread + confirm 104126 in your model’s parts breakdown
- Note: Sometimes associated with 104442—confirm supersession for your model
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Technical Overview & Compatibility for Graco 104126 – Boss Plug
The Graco 104126 Boss Plug is a hex-head sealing plug with 3/4-16 UNF threads used to close a threaded “boss” port in Graco fluid systems—commonly seen on high-pressure filter modules and select air-operated diaphragm pump assemblies. Always verify fit against your machine’s parts list before ordering.
Compatible Machines (to verify)
Commonly used where a 3/4-16 UNF boss port needs sealing; check your parts manual for 104126 specifically.
- Graco high-pressure / medium-volume filter assemblies (“Red Alert” style) – boss port plug
- Selected Graco air-operated diaphragm pump systems – unused or service port plug
- Other Graco sprayers that incorporate a 3/4-16 UNF boss in the filter/manifold block
Key Specifications
| Attribute | Detail |
|---|---|
| Part Number | 104126 (Boss Plug) |
| Thread | 3/4-16 UNF (fine thread) |
| Head Style | Hex-head plug for easy torqueing |
| Typical Use | Seals threaded boss ports on filters/manifolds; service/inspection ports |
| Supersession | Sometimes referenced as replacing/relating to 104442 (verify in manual) |
Usage Notes & Safety
- Confirm the boss port is 3/4-16 UNF and that the parts list calls out 104126.
- Depressurize and drain the system before removal/installation to avoid fluid injection hazards.
- Clean threads and apply the sealant specified by Graco for your system.
- If your manual lists 104442, check if 104126 is the approved replacement before use.
Hand-start the 3/4-16 UNF threads to avoid cross-threading, then torque to the value in your service manual. Inspect sealing surfaces and replace damaged O-rings/washers if your assembly uses them.
Look for the plug location in the filter/manifold exploded diagram. If the manual notes 104442, confirm whether 104126 is the approved replacement for your specific model revision.
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