PVC Schedule 80 Fittings are for pressure applications and have a thicker wall than Schedule 40. PVC Schedule 80 is highly durable, with high tensile and impact strength. It has better sound deadening qualities than PVC and ABS Foam Core. Installation requires the use of primer and solvent cement. California Prop 65: This product can expose you to chemicals including titanium dioxide and carbon black which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov