Rain Bird 600 Series X43260 1/2" Twist Lock Coupling simplifies the installation of all industry standard dripline and distribution tubing. They provide an even tighter seal on tubing by using high quality barbs and twist-locking nuts. Their unique barb design reduces insertion force while maintaining a secure fit. Ideal for use with Rain Bird XFD, XFS and XFCV dripline, XF blank tubing, XT700, XBS and QF Header distribution tubing.