Needle valves are available with 1/8 or 1/4 female pipe threads or with 1/8 or 1/4 male pipe threads, also 1/4, 3/8 or 1/2 inch barbs. Optional is 1/4 or 3/8 OD push-in. Body is made of PVC or polypropylene, with seals of EPDM or Viton.  Units can be panel mounted. 7 turns for full open. 125 PSI pressure. 2.5 degree needle with 4 degree or 45 degree  needle on special order.