Zinc plated pump 

This Rieke pump is for dispensing solvents and non-corrosive liquids. The self-venting design eliminates a need for an air vent opening. Pump includes a plastic Flex-spout mounting cap and a stabilizing metal strap for mounting to Sigma-Aldrich 20L Flex-spout cans. Pump may also be used with Sigma-Aldrich 20L NPT threaded cans with 2in. bung (NPT adapter Z557811 is required).
Dispenses 100 mL/stroke.