Durable pump which attains and holds vacuum of 25 inch Hg. Small size has pumping rate of 15 mL per stroke and 3(psi) positive pressure. Large size has a rate of 36mL per stroke and 7(psi) positive pressure. Removable cover on exhaust port and trigger vacuum release. Supplied with 2 foot length of tubing. Units are lightweight and self lubricating (N6131)
