Generally, they can occur from one of the following causes: 1  Infection. 2  Environmental exposure. 3  Malignancy. 4  Occupational exposure. 5  Collagen vascular disease (an inflammatory condition of the body including the lung) 6  Drugs. 7  Idiopathic (unknown causes)
01-08-2006, 09:34 AM. Check to see if you have the tap marker (handle) turned down to far. The jam nut (lever collar) for holding the marker straight should not be touching the lever bonnet. The bonnet is the nut that holds everything to the faucet. If it is touching, this will cause your sticking Faucet.
WHAT CAUSES A PIN HOLE WATER LEAK. In most cases the leaks occur near the water main inside the house. They occur near the water main because this is where the water pressure is the greatest in the home. Just like how water over time can cut deep into rock creating things like the Grand Canyon it also can erode the inside of your pipe.