Rain Bird SBA050 Spiral Barb Adapter 1/2" (50) Fittings are made of robust acetal material to make connecting swing pipe fast and easy. Easy twist-in insertion  no glue or clamps needed for installation. Aggressive barb lip makes a secure connection that is less likely to leak. Broad range of shapes and sizes allow the contractor to choose the best fitting for the application. Extended length and aggressive barb lip prevent blow outs, reducing likelihood of contractor call backs.