Designed for automatic transfer of accurately measured repeat doses. Precise and constant volume delivery is assured by tightening the adjusting screw with a lock nut. Consists of a lock type syringe, metal holder with plunger spring, washer and extension: and a molded buna n rubber filling outfit made up of a two way valve, 20 inches of latex tubing and a spherical metal sinker. All metal parts are chrome plated brass with exception of the stainless steel plunger. All sizes have a repetitive filling accuracy of 1% over recommended filling range.