They are inflated by blowing into a valve, either with a manual or an electric pump. some are automatically inflated when a valve is opened, up to a certain pressure with additional inflation manually or by pump. WE CAN SUPPLY AND INSTALL ANYWHERE IN NIGERIA OFFICES IN LAGOS, ABUJA, PORT HARCOURT AND BENIN CITY Please CALL: 0907-643-3020, 0904-936-7703 WhatsApp: https://wa.me/2349076433020 Email: info (AT) scantrikmedicalsupplies.com Web: www.scantrikmedicalsupplies.com/products