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.
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.
Commonly used where a 3/4-16 UNF boss port needs sealing; check your parts manual for 104126 specifically.
| 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) |
