Product#: TG-6988 Availability: This item normally ships within 1 - 2 business days. Description: Single stage oil diffusion pump. Top connection is 15 mm O.D. and system Tubing is 30 mm. Boiler is 100 ml for use with 100 ml soft shell heating mantle. The connecting arms can be supplied with stopcock, valves, connecting fittings to meet your needs.