These check valve taps are the latest in tap technology. When it gets cold at night your tree develops vacuum and sucks germs back in through the tap hole. By not allowing any contamination back into the tap hole, the hole does not recover over as fast and it enables you to get more sap over a longer duration of time.
Check Valve taps keep bacteria out of your tap hole
Less Bacterial means more sap and an extended season
Use a 5/16" drill bit to drill a hole into your tree and simply hammer this tap into place.
Spouts can be reused year after year