15/16" (24mm) and 1/2" (12mm) Dual stacked tips. Base tip has a 15/16" (24mm) bore with 1.5" (38mm) NH female thread inlet. Top tip has a 1/2" (13mm) bore with male threads. Base tip outlet has female threads for durability. Easy to read pressure/flow charts are laser engraved. 1.5" NH (38mm) inlet thread is standard.