Conduit Adaptors, Male Bushes & Reducers
The fittings that get conduit into a box or an enclosure, and step between sizes. Small parts, but the ones that decide whether an entry is mechanically sound and properly finished.
Also searched as: male bush, female adaptor, box adaptor, conduit adaptor, check ring, reducer, coupling reducer
Male bushes
A male bush finishes the conduit at a box entry, providing a smooth radiused mouth so cable insulation is not damaged as it is drawn in. Codes AEMMB2 through AEMMB6. Never leave a cut conduit end in a knockout without a bush — the sharp edge will eventually cut through insulation.
Female and male adaptors
Female thread adaptors with male bushes (AEMAB2–6) take the conduit into a female-threaded box entry. Male thread adaptors with check ring (IMMA7, IMMA8) suit male-threaded entries, the check ring locking the adaptor at the right depth. Double-ended female adaptors with a male bush on both sides (IMDA2, IMDA3) join two threaded entries back to back.
Reducers
The MR2 reducer steps 25mm down to 20mm, which is the common transition where a 25mm sub-main route branches into 20mm final circuits.