Leaking and clogged tubeless valves can be a pain-point, but both are easily remediable. 

For clogged tubeless valves or valves that are slow to let air both in and out - the valve-core itself can be replaced with a fresh set HERE or by going to any local bike shop

Read more about tubeless mid-season refresh HERE. 

For leaking tubeless valves on any road or SES tubeless compatible wheels, be sure to install the Pressure Relief Valve Stem Nut. This leaking noise may be a hint to damaged rim tape that’s allowing air down into the rim section and past the valve. Read about how to install these pressure relief valve stem nuts HERE.