Self-drilling valve

摘要: A self-drilling valve for tapping into water mains is disclosed. The provides a through bore providing seat at its forward end and threaded the remainder of length. cutter located in head rearward relatively long, tubular shank end. Cutting edges are provided so that when rotated forwardly against surface main, an opening cut wall thereof. guiding seal positioned adjacent to prior during cutting operation laterally position operation. Such remains with as retracted extends all positions does not have re-enter seal. closed by threading forward, causing be within provide positive between housing.