Keeps dirt and debris out of disconnected Pioneer-style AG hydraulic couplings. The Breco B-5205-4M is a rubber dust plug that seals the coupler opening on 1/2″ Breco 4000 Series couplings between uses. (Also known as the 4000 Series.)
Performance & Construction
| Fits Body Size | 1/2″ Breco 4000 Series |
| Type | Dust Plug |
| Material | Rubber |
| Temperature Range | -40F to +250F (standard seals) |
| Quantity | 1 pc |
| Origin | Made in USA |
Why this dust plug
- Keeps contamination out — seals the disconnected half against dirt, grit, and moisture.
- Sized to the 1/2″ body — a correct fit on Breco 4000 Series couplers.
- Flexible rubber — installs and removes by hand, no tools needed.
Frequently asked questions
Are these Pioneer / agricultural couplers?
Yes — these are the Pioneer-style AG couplers (Foster/Breco call them the 4000 Series) used on tractors, farm implements, and construction equipment. They interchange with the Pioneer 4000 ball-valve design.
What does it fit?
It seals the 1/2″ Breco 4000 Series coupler, for example B-4050-4.
Why use a dust plug or cap?
Contamination is the leading cause of hydraulic failure. Capping disconnected halves keeps grit out of the valve and seal.
Why buy from hpcouplers: Breco quality, responsive US-based support, accurate specs, fast shipping.
4000 Series (Pioneer AG Interchange) — Complete Series Chart
The size you are viewing is shown first, with the rest of the series below. Base couplings appear before ball lock and seal options. Dust caps and plugs fit by body size and are labeled by which half they protect. Click any part number to open that product.
| Coupler | Brand | Plug | Dust Cap/Plug |
Body Size |
Thread | Description |
|---|---|---|---|---|---|---|
| 1/2″ Body — Your Size | ||||||
| B‑4050‑15 | Breco | B‑8010‑5 | B‑5209‑4M (For Coupler) B‑5205‑4M (For Plug) |
1/2″ | 1/2″ | Steel |
| B‑4050‑16 | Breco | B‑8010‑5 | B‑5209‑4M (For Coupler) B‑5205‑4M (For Plug) |
1/2″ | 1/2″ | Steel |
| B‑4050‑4 | Breco | B‑8010‑4 | B‑5209‑4M (For Coupler) B‑5205‑4M (For Plug) |
1/2″ | 1/2″ | Steel |
| B‑4050‑4P | Breco | B‑8010‑4 | B‑5209‑4M (For Coupler) B‑5205‑4M (For Plug) |
1/2″ | 1/2″ | Steel, Poppet Valve |
| B‑4050‑5 | Breco | B‑8010‑5 | B‑5209‑4M (For Coupler) B‑5205‑4M (For Plug) |
1/2″ | 1/2″ | Steel |
| 1/4″ Body | ||||||
| B‑4050‑2 | Breco | B‑4010‑2 | B‑5205‑2M (For Plug) | 1/4″ | 1/4″ | Steel |
| B‑4050‑2P | Breco | B‑4010‑2 | B‑5205‑2M (For Plug) | 1/4″ | 1/4″ | Steel, Poppet Valve |
| 3/8″ Body | ||||||
| B‑4050‑3 | Breco | B‑4010‑3 | B‑5205‑3 (For Plug) | 3/8″ | 3/8″ | Steel |
| B‑4050‑3P | Breco | B‑4010‑3 | B‑5205‑3 (For Plug) | 3/8″ | 3/8″ | Steel, Poppet Valve |
| 3/4″ Body | ||||||
| B‑4150‑5 | Breco | B‑8010‑5 | B‑5209‑5 (For Coupler) B‑5205‑5 (For Plug) |
3/4″ | 3/4″ | Steel |
| 1″ Body | ||||||
| B‑4050‑6 | Breco | B‑4010‑6 | B‑5209‑6 (For Coupler) B‑5205‑6 (For Plug) |
1″ | 1″ | Steel |
| B‑4050‑6P | Breco | B‑4010‑6 | B‑5209‑6 (For Coupler) B‑5205‑6 (For Plug) |
1″ | 1″ | Steel, Poppet Valve |
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