3/4" x 3/4"D, Sharkbite Evopex Push Only To Connect Coupling, Designed To Use Without The Need For Additional Tools & Rings, No Special Tools, Soldering, Glue Or Crimping To Plumb An Entire Home, Reduces The Risk Of Install Errors & Potential Leaks, Just Push Onto Pex Pipe & Check The Green Visual Indicator To Ensure A Proper, Leak Free Connection, Made From Acudel Plastic, Provides Toughness & Chemical Resistance Along With Excellent Anti-Decay Stability & Dimensional Stability.