The Brass Impact Head works with or replaces 1/2 In. impact or impulse heads. It covers areas of 25 Ft. to 40 Ft. radius and can be adjusted from a partial to full circle. Brass Impact HeadFor outdoor use with cold water onlyAnti-backsplash armCovers areas from 20 Ft. to 40 Ft. radius in a part or full circleAdjustableWorks with most 1/2 In. impact or impulse headsStream straightener vaneBrass bodyStainless steel arm spring, trip spring, strip collars, and trip pin1/2 In. male threaded