https://www.jpcorry.com/jp-corry-products/saint-gobain-pam-uk-watershed-d-i-gully-grate/
Saint-Gobain PAM UK Watershed D.I. Gully Grate
Description
WATERSHED D400 SINGLE PIECE END HINGED GRATE AND FRAME OPEN AT LEFT HAND END KITE MARKED
RECOMMENDED FOR USE IN: Carriageways carrying continuous heavy traffic where frequent access and maintenance is required
Datasheet :- Watershed-D400-Hinged-Grating-Range