1.3.1 Nut and Ferrule Fittings
A nut and ferrule are used to make an air-tight or water-tight connection. These connections are commonly
found between calorimetry and drinking components of the system and cages.
• To make a new nut and ferrule connection: trim the end of the plastic tube with a sharp implement
(tube cutter preferred) leaving the end as square as possible. Ensure there are no frayed edges on the
end.
• Slide the nut and 2-piece ferrule 3cm over the end of the tube as indicated in the diagram below.
• Fully insert and hold the tube (about 1cm) into the flared fitting on the cabinet or cage.
• Slide the nut (and ferrule) to the mating threads of the fitting and finger-tighten until firm.
Only use nylon ferrules, metal ferrules may leak when used with plastic tubing and can
damage metal sipper tubes. Excessive tightening may pinch the tube or damage the fitting.
1.3.2 Push-Fit Fittings
Push-Fit fittings are used to make air-tight connections. They are commonly found near components of the
system that may require frequent maintenance (such as filters) or around components which modify the
operation of the system (such as flow restrictors).
• To make a connection, ensure the end of the tube is smooth with no frayed edges. If required, trim the
end of the plastic tube with a sharp implement (tube cutter preferred) leaving the end as square as
possible.
• Fully insert the tube into the plastic fitting, through the resistance, until it stops (about 1.5cm for most
fittings). The tube should not pull free from the fitting and the locking collar around the tube socket
will travel and rotate with the tube.
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