Drain Nipples The Crossover Drain Nipple provides a method of draining the tubing by pressure. It does not require any mechanical manipulation and provides a positive means of dumping the fluid in the tubing string, permitting the fluid level in the well to equalize. It is also less expensive than perforating tubing. It helps eliminate pollution, fire hazard, and the expense and wasted time of wet jobs. It has a full tubing ID and provide a means to pump down the tubing to kill a gassy well.