Wash. Rev. Code § 7.72.040
(1) Except as provided in subsection (2) of this section, a product seller other than a manufacturer is liable to the claimant only if the claimant's harm was proximately caused by:
(2) A product seller, other than a manufacturer, shall have the liability of a manufacturer to the claimant if:
[ 1991 c 189 s 2; 1981 c 27 s 5.]