Interstate Pneumatic Button Valve features solid brass construction and Buna-(Nitrile) seals. Normal valve position is closed. Ideal for air and liquid in-line applications for up to Max 175 PSI working pressure. WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.