[Class : 19] Solid Top Manhole Covers (Not Of Metal), Multiple Covers With A Frame, Recess Manhole Covers With A Frame And Air & Watertight Covers With A Frame (Not Of Metal), Gratings (Non Metallic ), Chambers [Non Metallic Structures], Water Gully Covers With Frame (Not Of Metal), Hinged Overhead And U.G. Water Tank Covers With Frame (Not Of Metal), Drain Channels With Grating/Gully Cover (Not Of Metal) Included In Class 19