Swing joints allows for easy adjustment of head to the correct level and minimises pipe breakages when the sprinklers are run over by heavy equipment.
Please note that a lot of new large sprinklers have the ACME threads so when fitting new sprinklers to existing Swing Joints you may require acme adaptors.
Poly swing joints and Swing Pipe & Fittings (enables you to make your own Swing Joints) we use a variety of makes.