This is where you'll be able to find textures for use with Zombie Panic Source or Team Fortress 2.

ZPS: Animated Sprinkler TextureVERSION: B1
ZPS: Animated Sprinkler TextureSprinkler texture. Attach to an angled cylinder, line up the textures, make func_brush (non-solid). Add a water sound and an env_steam to make the effect more convincing.

The original sprinkler texture was found on an opensource image site, so I can't take credit for it and none of my usual usage rights apply to this pack. Download size ~43KB.
Download ZPS: Animated Sprinkler Texture