Live Swivels

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https://www.surpluscenter.com/Hydraulics/Hydraulic-Adapters-Fittings/Live-Swivels/NPT-Female-to-NPT-Female---Straight/1-2-NPTF-x-1-2-NPTF-Live-Swivel-Coupling-LV5000-08-08-9-LV5000-8-8.axd

Rotary Unions in 360 Excavator

A specialized rotary union is used, not just a simple live swivel - [1]
Explanation from hydraulics and pneumatics - [2]
In real life: Infinite spin is attained.

Rotating 360 Without 360 Rotary Union?

Backhoe vs Excavator

Backhoe spins 200 degrees, excavator a full 360 degrees. [3]

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