Having worked on Big Triumphs during the 70s,80s and 90s there was always one manufacturer of water pumps and clutches we stayed well clear of and that was Quinton Hazel,the pump impellers were made of plastic and they disintergrated like clockwork,the clutches did not fare any better with a poor build quality,I notice that these water pumps on Ebay are QH, STAY WELL CLEAR