SRD:Necklace of Adaptation

Necklace of Adaptation: This necklace is a heavy chain with a platinum medallion. The magic of the necklace wraps the wearer in a shell of fresh air, making him immune to all harmful vapors and gases (such as cloudkill and stinking cloud effects, as well as inhaled poisons) and allowing him to breathe, even underwater or in a vacuum.

Moderate transmutation; CL 7th; Craft Wondrous Item, alter self; Price 9,000 gp.