HQ Pipeline Ductile iron grooved fittings and grooved couplings are UL listed and FM approved in the early years before they were exported to worldwide. The grooved fittings and couplings are designed in grooved piping systems with characters: low installation cost, flexibility and rigidity, joint reliability, isolate noise and vibration, convenient joint, are widely used for heating, ventilation and air conditioning, water treatment, plumbing, mining, and fire protection systems. The quality are strictly controlled from the raw material (ductile iron ASTM A536) to the finished product. Surface threatment can be painting, epoxy, decromet, galvanized, color can be red, blue, white, orange according to customer’s requirement.
