Housing is made of rust-proof aluminum, built-hardened steel raceway, ball can roll on
Velocity and Feed Controllers. Nylon end caps at both ends of the housing means for positioning the ball while preventing the entry of dust and water, and therefore allows the unit to operate in dusty and wet environments. Jin, outlet pipe threads are standard, so that the exhaust
polyurethane tube can be drawn to ensure barrier-free exhaust. To adapt to different installation location.
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