ULC 551
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1 SCOPE
1.1 This Standard contains requirements for 25 and 38 mm forged quick connect couplings and adapters of the external lug design for use in the forestry service.
NOTE 1: Quick connect coupling and adapter sizes stated refer to the nominal diameter of the forestry hose.
NOTE 2: The requirements for non forged External Lug Quick Connect Couplings and Adapters for Forestry Fire Hose are contained in Standard CAN/ULC-S558.
1.2 The couplings and adapters are intended for use with forestry fire hose of the 25 and 38 mm standard sizes.
| Edition | 3 |
|---|---|
| Published Date | December 01, 2013 |
| Last Revision | November 13, 2023 |
| Language | English, French |






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