Product Description Rain Bird Barbed Pipe Coupler 17mm for XF Dripline Easy-to-Install. Complete line of 17 mm inserts fittings to make XF Dripline installation faster and easier. Unique barb design coupled with the Inserting Tool reduces the insertion effort by 50%. Easier to insert than any other 17 mm acetal fittings even without using the Insertion Tool. Made of sturdy, break-resistant and UV-resistant plastic to ensure durability. Two high barbs grab tubing for the most secure fit without clamps.