Genuine EDGE™ Precision Diffuser – Replacement Diffusers for EDGE Coverage TIG Cup Systems Keep your EDGE Coverage TIG Cup System performing at its best with a Genuine EDGE™ Precision Diffuser. These replacement diffusers are designed specifically for the EDGE Coverage Series of TIG Cups and are manufactured for proper compatibility with each cup size. Compatible With #12 Coverage Cup (Quartz or Pyrex) #12 Shorty (Quartz or Pyrex) #12 Super Shorty (Quartz or Pyrex) 12 Narrow Pyrex only #15 Coverage Cup (Pyrex) #18 Coverage Cup (Pyrex) #21 Coverage Cup (Pyrex) #23 Coverage Cup (Pyrex) Note: The #12, #12 Shorty, and #12 Super Shorty all use the same diffuser and are available in Quartz or Pyrex. Sizes #15 through #23 are Pyrex only. Available Options Coverage Cup Size #12 / #12S / #12SS – Quartz #12 / #12S / #12SS – Pyrex #15 #18 #21 #23 Tungsten Opening 1/16" (1.6 mm) 3/32" (2.4 mm) 1/8" (3.2 mm) 5/32" (4.0 mm) Please select both your Coverage Cup size and tungsten size before ordering. Replace with Genuine EDGE™ Components Replacing a damaged or worn diffuser helps maintain proper compatibility and keeps your EDGE Coverage TIG Cup System operating as designed. For the best fit and performance, always use Genuine EDGE™ Precision Diffusers with genuine EDGE cups and components. Need help identifying your diffuser? Contact our team—we'll help you select the correct replacement.