These Kuriyama-Couplings™ are made of 304 stainless steel. Commonly used in the agricultural and construction industries. Pressure rating at 70°F: 1/2" - 1-1/2" are rated to 125 psi and 2" - 6" are rated to 75 psi.
Note: Product testing for individual applications is recommended before use. U.S. Plastic Corp. cannot be held liable for individual application failures.