Engineered to glide seamlessly inside the stem of the valve, this latest innovation from the Muc-Off Dev Lab allows you to easily check the health of your sealant inside the tyre, without needing to break the bead, or remove the tyre!Running tubeless tyres with free-flowing sealant is crucial for preventing flats and maintaining riding performance. With the 'Hey Dipstick!the job just got a ton easier, so you can focus more on enjoying your ride and less on maintenance.Ideally use with our Big Bore valve range for super simple pre ride sealant checks, just open the lever on the valve and slide theHey Dipstick!down the valve and inside the tyre.Then simply pull out and you can see the health of your sealant instantly. If its drying out or the level looks very low just add more sealant.If using a regular presta valve you can remove the core and carry out the same procedure.Make theHey Dipstick!part to your workshop tool kit - Stay ahead of pesky punctures and ride uninterrupted