While you wait for answers, we may have found some information which could help you.
Click here for Flush Thoroughly Second Modelwhere can I get spares for a Derwent Macdee 9.5 inch round syphon ?
Macdee Metro 3 Part Toilet Syphon?
Toilet seat?
how do I adjust a dve 0600?
cistern constantly fills and runs into toilet pan?
Derwent Macdee metro syphon repair?