The Angle Body Piston Valve is a 2-way direct acting valve available in a x For all optional AISI L Stainless Steel constructions, contact ASCO. NC. NO. 22. SERIES. Air Operated. Optional Ordering Specifications: Visual position AISI L Stainless Steel version, contact your local ASCO. Buy Asco Piston Poppet Process Solenoid Valves A direct from Motion Industries.