Pipe Bomb

The Pipe Bomb is a powerful canister-like grenade that emits a small beeping sound if thrown and draws normal Infected to and after quick beeping it explodes, killing the Infected drawn into it. The pipe bomb may also hit survivors if caught in its explosion radius. The pipe bomb is extremely handy for defending vomited survivors, clearing an area of infected, not using up ammo at finales, and saving your team from a Horde rush. It is much rarer than the Molotov, due to much better use than it in the proper situation.

According to the game's developer commentary, as it was originally conceived, the Pipe Bomb did not have the LED feature. Instead, it served as a conventional grenade. Because the zombies were prone to rushing at close quarters, this led to the Pipe Bomb being much less useful than the molotov, which could damage enemies that rushed throught the flames. Valve fixed the problem by giving it the ability to attract zombies, making it useful for diverting large amounts of zombies.

Tactics

 * Hold on to pipe bombs until attacked by a large horde, the effectiveness of the pipe bomb is proportional to the number of infected nearby.