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 20 L Flex-spout cans. Pump may also be used with Sigma-Aldrich 20 L NPT threaded cans with 2 in. bung (NPT adapter Thomas No. 1198X81 is required). Dispenses 100 mL/stroke.