When lives & property are at stake, you can rely on testing & maintenance products from HSI. Recognized world leader in design & manufacturing of smoke & heat detector testing products & equipment. Our patented products are reliable, easy, & affordable. | | Harvel® CPVC Fire Sprinkler Piping—offers proven performance with 20 years of service in demanding installations around the world. It meets the requirements of all major model codes: UL Listed, FM approved, and in strict compliance to ASTM standards. |