New lightweight valve self seals after each sip and can be opened and locked with one hand to prevent leaks when not in use. A dust cover protects the silicone valve from outside elements. Weight: 10g High-flow valve delivers water when you need it most. Self-seals after each sip and can be open and closed during activity with one hand. Dust Cover protects silicone bite valve from collecting dirt Universal ¼ diameter fitting Safe and Reliable 100% BPA and PVC Free
Best Price: £7.20 from Cyclestore