RULE 22
                        INTERPLEADER

    (a) Rule. Persons having claims against the plaintiff may be joined as
defendants and required to interplead when their claims are such that the
plaintiff is or may be exposed to double or multiple liability. It is not
ground for objection to the joinder that the claims of the several
claimants or the titles on which their claims depend do not have a common
origin or are not identical but are adverse to and independent of one
another, or that the plaintiff avers that he is not liable in whole or in
part to any or all of the claimants. A defendant exposed to similar
liability may obtain such interpleader by way of cross claim or
counterclaim. The provisions of this rule supplement and do not in any way
limit the joinder of parties permitted under other rules and statutes.
    (b) Statutes. The remedy herein provided is in addition to and in no
way supersedes or limits the remedy provided by RCW 4.08.150 to 4.08.180,
inclusive.