These YellowDuct joiners are used to snap together system components and straight ducting raceway. They simply snap into the slots in the end of each piece to be joined. "Slotless" joiners are available in sizes from 100mm x 50mm upwards and will join the ducting raceway components with or without joining slots Note: For straight ducting raceway that has been cut to length, new slots need to be made with a suitable size slotting tool when using slotted joiners.