1、The delay solenoid valve is equipped with a check valve, which can replace for OTS air compressor accessories 2、Solenoid valve is sensitive, non‑stuck, durable and air‑tight, possess excellent performance 3、Support simple operation, the red and black cables are both positive and negative, and can be used after connecting to the circuit 4、Come with electric drive mode, safe to use, possess stable structure and long service life 5、The interface thread diameter is 16mm and 14mm, flexible and can be adapted to many machines Item Type: Electric Solenoid Valve Model: Delay solenoid valve + check valve Material: Plastic + aluminum alloy Interface Thread Diameter: Approx. 16mm / 0.6in(big), 14mm / 0.6in(small) Drive Mode: Electric Purpose: Silent oil-free machine accessories 1 x Electric Solenoid Valve