Product Details
Keeps dirt and debris out of disconnected ISO-A hydraulic couplings. The Breco B-6659-16 is a steel dust plug sized for 1" ISO 7241-1 Series A couplings. (Also known as the 6600 Series.)
Why this dust plug
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Keeps contamination out — seals the disconnected half against dirt, grit, and moisture.
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Sized to the 1" body — a correct fit on ISO-A 6600 Series couplings.
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Steel construction — stands up to jobsite handling.
Frequently asked questions
Are these ISO-A couplers?
Yes — the 6600 Series conforms to ISO 7241-1, Series A. It mates with any Series A half of the same body size, from any manufacturer.
What does it fit?
Any ISO-A 1" coupler. The matching part is B-6601-16-16.
Why use a dust cap or plug?
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.
ISO-A Series (ISO 7241-1 Series A) — 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.
