Food contact suitability of the raw material, it has not been tested on the final product. Valley D=7.8/10 mm.. Prevents water back-flow when pressure falls. Useful for any tubing system and vacuum line. Maximum safe working pressure: 2 BAR (equal approx. 28.4 P.S.I.). Minimum safe working pressure 0,07 BAR at room temperature (20°C). Material: PP inner disk Dutral.