The WaterCop Water Shut-Off Valve (With Lever Handle for Rough In, Lead Free) is one component of the WaterCop system. WaterCop Emergency Water Shut-Off Systems help to effectively reduce the chance of catastrophic water damage caused by common plumbing and appliance problems. This can greatly reduce home insurance risk through proactive loss mitigation. WaterCop Systems can be configured from the following components: First choose the correct size Water Shut-Off Valve. Next add flood sensors to monitor leak-prone areas of your home and temperature sensors to monitor areas that are susceptible to freezing. Finally add the WaterCop Water Control Switch and cabling to create a smarter home that costs less to insure. DIAMETER: 3/4 inch.