Abstract: A nipple adapter including a nipple having a first outer sealing flange and a second outer sealing flange, and a cylindrical nipple housing. The nipple housing includes an inner annular wall that defines a bore extending axially through the housing, an annular flange disposed on the inner annular wall, a first thread extending from the annular flange to a first axial end of the nipple housing, and a second thread extending from the annular flange to a second axial end of the nipple housing, the first thread having a pitch that differs from that of the second thread. The nipple is reversibly disposed within the nipple housing such that the annular flange is disposed between the first and second outer sealing flanges and the first and second threads are alternatively exposed for mating with corresponding threads of a variety of water bottles.

Abstract: A nipple adapter including a nipple having a first outer sealing flange and a second outer sealing flange, and a cylindrical nipple housing. The nipple housing includes an inner annular wall that defines a bore extending axially through the housing, an annular flange disposed on the inner annular wall, a first thread extending from the annular flange to a first axial end of the nipple housing, and a second thread extending from the annular flange to a second axial end of the nipple housing, the first thread having a pitch that differs from that of the second thread. The nipple is reversibly disposed within the nipple housing such that the annular flange is disposed between the first and second outer sealing flanges and the first and second threads are alternatively exposed for mating with corresponding threads of a variety of water bottles.