Irrigation
Swing Joint vs. Funny Pipe: What's the Difference?
Swing joint vs. funny pipe explained — funny pipe is the flexible tubing, a swing joint is the finished assembly it builds. When to buy a pre-made swing joint and when to build your own from a coil.
By Innovative Plastics Manufacturing
If you have shopped for sprinkler parts, you have seen both terms — swing joint and funny pipe — sometimes used as if they mean the same thing. They do not. The short version: funny pipe is the flexible tubing; a swing joint is the finished assembly you build with it. Understanding the difference tells you exactly what to order.
Funny pipe is the tubing
Funny pipe — also called swing pipe — is flexible low-density polyethylene (LDPE) tubing that bends at sharp angles without restricting flow. It is a single component, sold by the coil and cut to length. On its own it does nothing but flex; its job is to be the bendable segment in a larger connection. Innovative Plastics sells it as a swing pipe coil — 100 ft of ½” tubing, .690” OD × .490” ID. For a full primer, see what is funny pipe.
A swing joint is the assembly
A swing joint is the complete flexible connection between a buried lateral line and a sprinkler head. It combines several parts:
- Funny pipe — the flexible run that bends and absorbs impact.
- Funny-pipe insert fittings — barbed connectors (Celcon M90 acetal on our assemblies) that grip the tubing.
- A Marlex street ell — a self-lubricating HDPE elbow that gives the rigid, threaded transition to the head.
Together, these let you set the head to the correct height and angle, adjust it later, and — most importantly — absorb the shock of mowers, foot traffic, and vehicles so the impact is not driven straight into the lateral pipe. That whole finished part is the swing joint. Funny pipe is just the flexible heart of it.
Which should you buy?
Both routes solve the same problem; the choice is about how you like to work:
| Pre-assembled swing joint | Build your own from a coil | |
|---|---|---|
| What you buy | Swing joint assemblies | Swing pipe coil + fittings + Marlex ells |
| Best for | Fast installs, consistent lengths | Custom lengths, lowest cost per joint |
| Sizes | ½” and ¾”, 6” or 12”, 1- or 3-ell | Any length you cut |
| On the truck | Ready to install from the case | One coil covers dozens of heads |
Choose the pre-assembled swing joint when you want to drop in a finished part and move on — it arrives ready to install in ½” and ¾” sizes, 6” or 12” lengths, and 1- or 3-ell configurations. Choose the coil when you would rather cut each run to length and build joints on site, which is often more economical and flexible than stocking every fixed size.
Building your own
If you go the coil route, our step-by-step guide to building a swing joint walks through it: insert an ell at each end of a cut length of funny pipe, thread one side into the lateral fitting and the other into the head, and flex the pipe to position. And if you are working on a Rain Bird system, our note on Rain Bird compatibility confirms the dimensions line up.
Frequently asked questions
- Is a swing joint the same as funny pipe?
- No. Funny pipe (swing pipe) is the flexible LDPE tubing; a swing joint is the finished connection built from that tubing plus fittings and a street ell. Funny pipe is one component of a swing joint — the flexible part that lets the assembly bend and absorb impact.
- Do I need a swing joint or just funny pipe?
- If you want a ready-to-install connection, buy a pre-assembled swing joint. If you would rather cut runs to length and build joints on site, buy a coil of funny pipe plus funny-pipe fittings and Marlex street ells and assemble your own. Both solve the same problem — positioning the head and absorbing impact.
- What holds a funny-pipe swing joint together?
- Barbed funny-pipe insert fittings grip the flexible tubing, and a Marlex HDPE street ell provides the threaded transition to the sprinkler head and the lateral fitting. Marlex is self-lubricating, so the threads make up leak-free without sealant.
