Part number 779-121 is a plastic plug, 1x2 rectangle used to seal unused openings, ports, or cavities on compatible PowrLiner and ProMark line stripers. It helps prevent debris, moisture, and contaminants from entering sensitive areas of the machine, protecting electrical connections, hydraulic components, or paint pathways. Replacing a missing or damaged plug restores the protective seal and maintains the integrity of the equipment.
| Part Number | 779-121 |
|---|---|
| Part Description | Plastic Plug, 1x2 Rectangle |
| Brand | PowrLiner / ProMark |
| Fits | Select PowrLiner & ProMark models (see long description) |
| Condition | New |
The 779-121 Plastic Plug (1x2" Rectangle) is a simple but essential component used to seal unused openings in the frame, control box, or component housings of compatible PowrLiner and ProMark line stripers. It fits snugly into rectangular ports, preventing dirt, water, and paint overspray from entering areas that house electrical connections, sensors, or mechanical parts.
Over time, these plugs can become brittle, crack, or fall out due to vibration, temperature changes, or impact. A missing or damaged plug leaves the opening exposed, which can lead to corrosion, short circuits, or contamination of paint and hydraulic systems. Replacing it with a new 779-121 plug restores the factory seal and protects your investment.
| Seals openings | Fills rectangular ports to keep out dust, moisture, and paint overspray |
|---|---|
| Protects components | Shields electrical connectors, sensors, and mechanical parts from contamination |
| Maintains integrity | Prevents corrosion, short circuits, and blockages caused by foreign material |
| Missing | Plug is absent, leaving an open hole |
|---|---|
| Damaged | Cracked, brittle, or broken plug that no longer seals properly |
| Loose fit | Plug falls out or can be easily dislodged |
| Contamination evident | Dirt or moisture found inside the formerly sealed area |
Part 779-121 is compatible with the following PowrLiner and ProMark line stripers. Always verify the location and size of the plug needed using your machine’s parts diagram.
| Model | Notes |
|---|---|
| PowrLiner 3500 72v | Rectangular port plug |
| PowrLiner 3500 | Rectangular port plug |
| PowrLiner 3500s | Rectangular port plug |
| PowrLiner 4500 | Rectangular port plug |
| PowrLiner 5500 | Rectangular port plug |
| PowrLiner 4955 | Rectangular port plug |
| PowrLiner 6955 | Rectangular port plug |
| PowrLiner 8955 | Rectangular port plug |
| PowrLiner 2800 | Rectangular port plug |
| PowrLiner 4900XLT | Rectangular port plug |
| PowrLiner 4900 | Rectangular port plug |
| PowrLiner 6900 XLT | Rectangular port plug |
| PowrLiner 6900XLT SP | Rectangular port plug |
| PowrLiner 4950 | Rectangular port plug |
| PowrLiner 8900XLT SP | Rectangular port plug |
| PowrLiner 8900 | Rectangular port plug |
| PowrLiner 6950 | Rectangular port plug |
| PowrLiner 6950_1 | Rectangular port plug |
| ProMark II (759-2010) | Rectangular port plug |
When inspecting or replacing plastic plugs, consider checking these related items that may also wear or become damaged.
Rubber or plastic grommets around wiring and tubing can deteriorate, allowing contaminants to enter.
Larger covers or caps may be missing or cracked; they work alongside plugs to seal the machine.
If the plug protects an electrical port, the connector itself may need inspection for corrosion.
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