Specifications: This ZL-P16 has an inner-laid air chamber and a septum-shaped cylinder. The septum leather cup is made from Thermoplastic Elastomer(TPV), thus it possesses the excellent dynamic fatigur resistant property, and good resistance to aging, many kinds of pesicides and spray reagents. Also it has a long longevity to use. Because of the limited space In the shed its rocker arm is designed in fission type and at the Bottom of liquor tank so as not to destroy the shed film, melons, Fruits and vegetables. It also can be used in pests prevention And control or sterilization. Features: 1) Material: Plastic/vulcanized rubber (TPE) 2) Space-saving design 3) Leather cup 4) Chemical-retardant 5) Extended connecting rod cable