Features: *Brand new and . *Made of materials, you can buy it with confidence. *The check valve is based on pure physical principles. No electricity or switch is required when using it. *Installation should be carried out in the direction of the arrow. *I believe this product can help you. Specifications: Product name: check valve Material: stainless steel Color: as shown in the picture Size: 33mm Package contents: 1x check valve Notes: 1. Due to various factors such as display brightness, light brightness, etc., the actual color of the product may be slightly different from the picture shown on the website. 2. Please allow slight manual measurement deviation in the data. Made of materials, you can buy it with confidence. The check valve is based on pure physical principles. No electricity or switch is required when using it. Installation should be carried out in the direction of the arrow. I believe this product can help you. Product name: check valve