Series 521

Enhance Your Pneumatic System Performance with ASCO Series 521 Mini Spool Valves – Solenoid Air Operated. Made from Durable Anodized White Aluminum Body, POM Cover, and Internal Parts of Stainless Steel, Light Alloy, and POM. NBR Seals Ensure Reliable Operation, and the Spool Valves Can be Mounted in Any Position with 2 Mounting Holes in the Body. Enjoy Easy Installation with Standard ISO 228/1 and ISO 7/1 Thread Connections, Available in 1/4 and 1/8 Sizes. Each Spool Valve Comes with Multi-Language Installation and Maintenance Instructions.