oilfield drilling crossover sub drill sub

Product Description Drill subs have two primary applications. They can be used to cross over from one connection size to another, or as the disposable component used to extend the connection life of a more expensive drill stem member. Installing a float sub (with check valve) is always a good idea when drilling in wet situations. Features 1. PI standard drilling cross-over sub 2. BOX x BOX, BOX x PIN, PIN x PIN 3. Different API Standard connection type, e.g. NC, REG, FH, IF