... 3.Rubber seal,acid-resistance 4.OEM/ODM serve E-bike battery rubber plug caps 1.Appling for lead acid storage battery,UPS battery,Motorcycle battery,E-bike battery 2. HNBR, NBR ... /rubber caps/plug caps/rubber hole plugsCertificateISO9001:2008ApplicationAppling for lead acid storage battery,UPS battery,Motorcycle battery,E-bike battery Good function of sealing and attenuating shock.Advantagesa ...