Gregory Soft Sip Bite Valve Optic Blue One Size. Specifications for Gregory Soft Sip Bite Valve: Manufacturer: Gregory Size: One Size Weight: 0.35 oz Quantity: 1 Color: Optic Blue Dimensions: 2.25 x 1.5 x 1 in Last Chance: Yes Features of Gregory Soft Sip Bite Valve Soft molded mouthpiece. Lever action leak proof closure. Compatible with 0.25in/.635cm inner diameter hose. Magnetic attachment included for attachment to the sternum strap. Package Contents: Gregory Soft Sip Bite Valve Gregory 145290-5583: Soft Sip Bite Valve Optic Blue One Size