A valve and retainer assembly particularly useful for latex balloons includes a valve body and a band valve. The valve body has a radial shoulder where the neck and mouth of a latex balloon may be received to affix the balloon to the valve body. A hollow stem communicates with the radial shoulder, and a one-way valve allows gas to be introduced through the stem into the balloon affixed to the retainer portion. A valve and retainer for filling first and second balloons further includes a slide disk having a seal sleeve that intimately fits over the stem portion, such that the sealing slide disk selectively slides along the stem portion so that the seal sleeve can selectively cover the at least one second balloon fill aperture; and a flexible band covering the at least one fill aperture of the fill portion.