CFR
- Title 1 - General Provisions
- Title 2 - Grants and Agreements
- Title 3 - The President
- Title 4 - Accounts
- Title 5 - Administrative Personnel
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- Title 18 - Conservation of Power and Water Resources
- Title 19 - Customs Duties
- Title 20 - Employees' Benefits
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- Title 22 - Foreign Relations
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- Title 39 - Postal Service
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- Title 45 - Public Welfare
- Title 46 - Shipping
- Title 47 - Telecommunication
- Title 48 - Federal Acquisition Regulations System
- Title 49 - Transportation
- Title 50 - Wildlife and Fisheries
57.13021—High-pressure hose connections.
Except where automatic shutoff valves are used, safety chains or other suitable locking devices shall be used at connections to machines of high-pressure hose lines of 3/4 -inch inside diameter or larger, and between high-pressure hose lines of 3/4 -inch inside diameter or larger, where a connection failure would create a hazard.
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