Q. Is my Engine Oil Drain Valve going to leak? A. No. The "ball valve" design of your Engine Oil Drain Valve is just like the design of valves used in pressurized gas applications. Every valve is constructed to exacting specifications and each and every valve is tested for air tightness before it leaves the factory. The Engine Oil Drain Valve has been tested and granted "Genuine Part" status by six major motor vehicle manufacturers in Japan. These approvals were not granted easily and gaining them was a testimony to the quality and durability of the Engine Oil Drain Valve. Q. Will my Engine Oil Drain Valve open up while I am on the road? A. No. In its closed position the Engine Oil Drain Valve extends from the oil pan only about one half inch more than a standard oil drain plug. The valve's simple but effective locking system requires two distinct actions to open it and its heavy-duty construction will withstand any engine vibration. Over 2,000,000 Engine Oil Drain Valves have been sold in the past eight years and no problems have been reported. Warning: For users under extreme conditions: If you are using the Engine Oil Drain Valve on off-road vehicles such as farm tractors and logging equipment under extreme environment (i.e. corn fields, brush areas), it is recommended that a hose clip as shown below be used for extra safety and security. The hose clip, which can be purchased at any hardware stores, will firmly keep the lever in the locked position at all times. Drain Valve Size Hose Clip Size T, FG Series 11/16" Clip F Series 5/8" Clip Q. Does my Engine Oil Drain Valve protrude into the interior of the oil pan and prevent full drainage of my engine oil? A. No. The threaded oil drain plug hole is always reinforced to accept the threaded bolt of the drain plug. Your Engine Oil Drain Valve will not extend past this threaded portion of the drain hole and will allow the oil to be properly drained. Your Engine Oil Drain Valve will let you drain your engine oil while it is hot without burning your hands and it is much more effective than trying to pump the oil out from above. Q. How long will my Engine Oil Drain Valve last? A. Your Engine Oil Drain Valve is constructed of corrosion resistant forged brass and stainless steel. To gain the approval of motor vehicle manufacturers it was subjected to minus 40 degrees Fahrenheit temperatures. It endured 336 hours of salt spray and thousands of openings and closings and still functioned perfectly. You can expect the Engine Oil Drain Valve to outlast your engine. Q. How much does the Engine Oil Drain Valve stick out from the oil pan? Is it safe to use the N-Type valve (with Nipple) for cars and light trucks? A. The Drain Valve for passenger cars and light trucks is approximately 7/8" thick. This means that the valve sticks out only 1/2" more than the regular plug head from the oil pan. The Nipple on the N-Type Valve extends from the valve for 5/8". We do not recommend using the N-Type valve for vehicles with low clearance, as the valve may stick out too far against the ground.