Ateco Large Plastic Coupler 404 Use in tandem with Ateco tips 807, 808, 809, 827, 828, 829, 847, 848, 849, 867, 868, and 869. Accommodates 9/16", 5/8", and 11/16" pastry tubes Eliminates the need to empty your decorating bag before changing tips Made of durable, white HDPE plastic with ridged sides along ring for easy assembly Ideal for bakeries and cafes