Features High Quality 5V 1-Channel Relay Module: This module offers high-quality performance with a 5V power supply and 1-channel bistable self-locking relay, ensuring reliable and efficient . Convenient Trigger Control: Easily activate the relay by clicking the trigger port to pull it in and hold, and click again to disconnect, providing convenient and intuitive control. and Long Service Life: Constructed with high-quality materials, this relay module is and has a long service life, ensuring lasting reliability for your applications. High Accuracy and Strong Stability: With high accuracy and strong stability, this relay module is easy to install and use, delivering and reliable performance for various applications. Safe Low Pulse Trigger: The trigger mode is a low pulse trigger, providing a more convenient and safer for your peace of mind. Features: 1、This piston ring set is suitable for GX390 GXV390 188F 13HP. 2、The 3 piston ring ports cannot be on the same side (it is better to stagger 120 in order), and the piston ring ports need to stagger the piston pin holes. 3、The piston ring has been installed and tested, can run at high speed and load, and is . 4、This gas engine piston ring is made of alloy material, with high hardness and strength. 5、The generator piston ring set is simple to install and easy to use. Specification: Item Type: Piston Ring Set Material: Alloy Purpose: Air-cooled diesel generator piston accessories Suitable Model: Suitable for GX390 GXV390 188F 13HP Piston Diameter: Approx. 88mm / 3.5in Thickness: Approx. 2mm / 0.1in 4mm / 0.2in Package List: 3 x Piston Ring Package List 3 x Piston Ring