The Power Tank Shock Chuck Xtra Long is a no-air-loss chuck (aka NAL Chuck) that uses knurled thumb nuts on the top and bottom and the copper seal has been replaced with a softer material, lowering the torque specs needed to get an airtight seal on the Schrader valve. We left wrench flats on the bottom nut in case extra torque is desired. The Xtra Long version has an extended chuck to work in more applications. One of the most annoying steps in shock tuning is simply getting your Nitrogen Shock Inflator on and off the Schrader valve stem. Traditional shock tools use zero loss air chucks borrowed from the aviation industry which require a wrench to use, making it difficult or impossible to access the Schrader valves on your shocks while they're on your rig. The T-Handle on top is also difficult to use and can cause sore fingertips after your fourth nitrogen charge. The two knurled thumb nuts attach to the valve stem and depress the valve core pin in two separate actions. This allows you to close the shock under pressure, ensuring no N2 loss when you remove the Shock Chuck. The PT Shock Chuck is rebuildable for years of use.