Yes. Oatey offers a #38494 WMOB and #38495 IMOB that have a Warnock Hersey Certification for 1 and 2 hour fire rated walls.
Does Oatey offer an UL listed WMOB or IMOB?
What materials are used to make WMOB and IMOB?
WMOB is a washing machine outlet box. This box is designed as a termination point for all drain and water connections necessary when installing a washing machine. IMOB is an ice maker outlet box, and is designed as a termination point for the water line connection when installing an ice maker.