Figure 3
BARB FITTINGS
KEISER machines also use a 1/4” urethane hose. This is more flexible than the
polyethylene tubing and is always installed on a barb style fitting. Barb fittings may also
be used on some machines with the 1/4” polyethylene hose and are used on all thumb
button air valves. Correct diameter of the barb is critical for proper sealing. Always use
barb fittings supplied by KEISER for proper fit. Hoses are installed to the barb fittings by
pushing the hose over the fitting. The barb ridges provide an air tight seal.
When replacing a component or hose using barb fittings:
1.
Cut the tubing 1/2” away from the component to clear the barb ridges.
2.
Pry the short hose section off the barb, being careful to avoid nicking or cutting
the barb ridges.
3.
Check the condition of the barb ridges. If they show cuts or nicks, replace the
fitting. When replacing a barb fitting a thread locking compound
(such as “Loctite
242 -Blue”) must be used on the threads to provide a proper air
seal.
4.
Push the end of the hose onto the fitting as far as you can.
Note:
The urethane hose may be pried off the fitting without cutting the hose.
The end of the hose will enlarge with repeated removals and will lose the ability
to seal properly. If this happens cut 1/4" off of the end of the hose and reattach it
to the barb.