Replace your RV 1/2" water heater drain plug quickly and easily with this convenient two-pack. Included in the two-pack is a standard plug for everyday use and a vented drain plug to use when your tank is empty and in storage. The vented plug helps provide airflow while keeping out bugs. Both drain plugs have standard 1/2-14 NPT pipe threads. Use three to five wraps of Teflon tape to seal threads to prevent leaking.