Nalge Nunc 2353-0012 Nalgene Replacement Mouth Piece 2 Pack. 90° angle allows for shorter tubes and less hassle during activity with a sleek, low profile design. Pivot valve for quick, one-handed on/off action, with magnetic clip to put valve where you need. Positive shutoff valve so water remains in drink tube when bite valve or filtration system is removed. Connect drink tube to filtration systems using our Quick Connect adapter . replacement mouth piece- 2pk.