How Combination Reducing Elbows and Tees Connect Poly Irrigation Pipe to Sprinkler Heads

CRE and CRT fittings are commonly used to connect polyethylene irrigation zone lines to sprinkler-head swing assemblies. They provide a poly-barb connection and a female threaded outlet for the first swing elbow.

What is a CRE fitting?

CRE stands for combination reducing elbow. It is installed where the zone line changes direction and a threaded sprinkler-head takeoff is needed. Hunter HydroTech commonly uses a version with a 1-inch poly barb and a 1/2-inch female threaded outlet.

What is a CRT fitting?

CRT stands for combination reducing tee. It allows the 1-inch poly zone line to continue while adding a 1/2-inch female threaded branch for a sprinkler swing assembly.

How the swing assembly connects

A 050 swing elbow threads into the 1/2-inch female outlet of the CRE or CRT. Swing pipe connects to that elbow and runs to the sprinkler head.

• Spray assembly: CRE/CRT → 050 → swing pipe → 050 → spray
• Rotor assembly: CRE/CRT → 050 → swing pipe → 075 → rotor

How Hunter HydroTech secures the poly connection

When replacing a CRE or CRT, Hunter HydroTech uses a correctly sized Oetiker stainless-steel crimp clamp on the poly-barb connection. The clamp must be positioned on the barbed portion of the fitting and properly crimped.

Common fitting mistakes

• Using a swing-pipe barb in polyethylene pipe
• Using a poly insert fitting in swing pipe
• Placing a clamp beyond the effective barb area
• Using an incorrect clamp type or size
• Cross-threading the 050 elbow
• Twisting the CRE or CRT while tightening the sprinkler head
• Reusing a cracked or distorted fitting

When replacement becomes professional work

Replacing a sprinkler head may be a homeowner-level repair. Replacing a CRE or CRT requires cutting the zone line, preserving enough pipe, selecting the correct fitting, properly installing the crimp clamp, flushing the line, and pressure-testing the repair. Professional service is recommended when access is limited, the line is active, or the pipe is brittle, damaged, or too short for a clean reconnection.

Related resources

• Swing assembly guide
• Common fitting mistakes
• Professional sprinkler fitting repair