Check valve made of PVDF on 6/4 hose. The plastic PVDF is ideal for ozone applications - also for pure oxygen ozone devices.
You can find the spare clamping ring here.
Technical data:
Material: PVDF (polyvinylidene fluoride)
Hose diameter: 6/4 mm
Pressure rang: 0...10 bar (at 23°C)
Temperature range: -40°C...-100°C