RCW 70.75.010: Standard thread specified—Exceptions.

All equipment for fire protection purposes, other than for forest firefighting, purchased by state and municipal authorities, or any other authorities having charge of public property, shall be equipped with the standard threads designated as the national standard thread as adopted by the American Insurance Association and defined in its pamphlet No. 194, dated 1963: PROVIDED, That this section shall not apply to steamer connections on fire hydrants.