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Below are the links to the specific pages.
Square Valve Covers come in three main types:
Hinged - with large hinge set in casing. Featured image - John Danks - shows this.
Hidden Hinge - Cover is wrapped around a long hinge pin. A gap appears. Featured image - Jenco - shows this.
Other - all square covers neither Hinged or Hidden Hinge.
NOTE : SQUARE COVERS - OTHER NOT UPLOADED YET
Featured Images:
#200 - John Danks & Son Pty Ltd standard hinged cover. John Danks & Son were a prominant plumbers requisite company for over 80 years.
#606 - Similarly - Jenco - has been producing Valve covers in all shapes and sizes for many decades. They make quite a number of models in the Square Cover design. The features one like the Danks cover was a main-stay for decades.