Transitioning PVC-Coated Conduit from 1″ to 3/4″

Question

Chris, I am transitioning my run from a 1” to ¾” and I am not sure what I should use to reduce down in size at the condulet body. Any suggestions?

Answer

In this instance, you should use a reducing coupling accompanied with a short nipple.. Often times a reducing bushing is used which will result in a system that is not sealed due to a gap left between the sealing sleeve and the conduit. Using a reducing coupling with a short nipple will solve this problem. Photos are included below for reference.

Incorrect Use of Reducing Bushing Creates Risk of Failure

Incorrect Use of Reducing Bushing Creates Risk of Failure

A reducing bushing (1″ – ¾”) was inserted into the C Condulet Fitting. The conduit entering this fitting is 3/4”. Take note of the gap between the sealing sleeve and conduit. This gap is a void where water can collect and will ultimately lead to failure over time.

Use Reducing Coupling for Transitioning for Maximum Protection

Use Reducing Coupling for Transitioning for Maximum Protection

Instead of using a reducing bushing you should use a reducing coupling (REC). The REC is female/female; to make the connection between the REC and condulet body use a short nipple. The desired end result is a sealed system.