15-20Liter high viscosity high harder grease pump silicon pump glue pump selant pump. Technical: Suitable for 15-20L drums Max. Delivery: 5L/min Features: Force feed high volume pumps Extreme viscous grease Reduce waste Clean and convenient method of drum change Our pumps take on the toughest challenges from transferring lighter fluids(oils, solvents and adhensives)to moving medium-viscosity materials(RTV silicone, greases, coatings, plastisols and offset inks) to pumping very heavy viscosity materials(ink flushes, epoxies and mastics). Positive-priming force on the material: Downward force of the follower forces material into the pump inlet, assuring positive priming of high-viscosity materials Follower Has an elastomer seal: Twin blade wiper seals against the material container's sides, preventing drying and contamination of the material and wipes the container's sides clean Four-way air valve control: This directional valve controls Up/down movement of the follower. Primer unit remains coupled to the air system at all times(use of an air regulator and gauge is recommended).