PWSC Universal 15 In. Pressure Washer Surface Cleaner Attachment – 3400 PSI, 1/4 by | Jul 22, 2026PWSC Universal 15 In. The Westinghouse 15 in. The 15 in. cleaning area will make quick work of large, flat areas both horizontally and vertically. Compatible for use on most gas pressure washers with a ¼ in.