The lotion pump have a safe and secure screw down head lock. It's easily engage by simply unscrewing the head. Safely store and transport product by screwing down the lotion pump's head back into the cap. They can be used for plastic and metal cap assorted size bottles. The 1.40 - 2.00 cc output per stroke allows for easy dispensing of liquid soaps,cosmetic lotions,hand lotions,body lotions,shampoos,hair conditioners and other high viscosity products. Products containing reactive ingredients such as essential oils must be tested with the closure and container combination for compatibility.