Materials: Stationary Ring:Ceramic Rotary Ring:Carbon Secondary Seal:NBR Spring:Stainless steel Fit for Shaft Diameter:12/15/18/20/25mm Opreating Temperature: -20°C~+100°C Opreating Pressure: ≤0.6MPa Speed: ≤5m/s Application:Clean water pump,In-line pump and general industrial pump Package includes:1pc