Plastic T Connector Orifice tube fittings are a practical and sometimes ergonomic way to sandwich a filter and/or orifice into a plastic tube system . Several orifices and/or filters can be placed in the same fitting streamlining the design and reducing the number of fittings needed. RB82599 is nylon and is for 1/8" ID flexible tubing. This product is available with our sharp edge ruby orifice series in sizes from 0.0004" thru 0.035". Filtration is an option.