Feipumfg Brass NPT oil sight glass FPY-061N offers high stability and scratch resistant borosilicate glass.

      Sealing is achieved by O-rings on both sides rather than on one side of the glass. Therefore, the tightness is not affected by the axial pressure.
      The glass window and the FKM Viton seal are suitable for hight temperature applications and it is compatible with aggressive fluids.This product can be used on gearboxex, pressurized oil tank，heating systems pumps and turbines.Tests for maximum pressure are available upon request.