Walter's Scrap Metal

Walter's Scrap Metal is an unmarked and repeatable quest in Fallout 3.

Detailed walkthrough
Walter in Megaton asks you to fix three leaking pipes found around the town. A Repair skill of 30 is required to fix the pipes. After the pipes in Megaton are fixed, Walter offers to buy scrap metal from you to maintain them.

Rewards

 * Walter gives you 10 bottle caps per scrap metal; if you decline payment, you will receive +10 Karma.
 * You also get a 5 XP reward per scrap metal you give Walter.