Features 1、Made of cast iron material, durable with standard manufacturing, easy to disassemble and install 2、550W double inlet and double outlet valve plate is common accessories for silent oil free machine 3、102mm long, 102mm wide, and 5mm thick valve plate is heat resistant, not easy to corrode 4、Drive mode is pneumatic, can be used for vacuum pump, useful and practical 5、Valve plate come with stable structure, excellent performance and long service life Specification Item Type: Valve Plate Model: 550W double inlet and double outlet LxWxT: Approx. 102 x 102 x 5mm / 4 x 4 x 0.2in Material: Cast iron Drive Mode: Pneumatic Purpose: Silent oil free valve plate, air compressor accessories Package List 1 x Valve Plate