Specification: Product name: One-way check valve Material: Nickel Plated Brass size: 1/2″ 3/4″ 1 Stable characteristics and high reliability. Easy to install and replace. Package include: According to your Choose! 1/2″ 3/4″ 1 Check Valve Nickel Plated Brass Toilet One Way Male/Female Thread. Product name: One-way check valve. Material: Nickel Plated Brass. Size: 1/2″ 3/4″ 1. Stable characteristics and high reliability. According to your Choose! Please make sure it is 100% right. All products in our store are elaborately made. We care about our valued buyers, if you have any questions, our Customer Service staff will be very glad to help you. We try our best to reply to your emails as soon as possible, however, due to the high volume of daily incoming emails and time zone difference, we may not be able to reply to your emails immediately. Please contact me before you return it. Feedback is very important to us. For the functional products in our shop, we make sure that the functions are the same as the description. About the product colour:Because of the different light and environment when the product is photographed, In a few instances the colour of the product may have a little colour difference with the actual colour of the product, I hope you can understand.