Hello, can you please tell me the diameter of the part that touch on the rim of the developing tank?
The lid will fit on all standard stainless steel tanks with an OD of 3 7/16 (8.8cm).
PHILIP R B
The diameter is 3.5 inches.
All lids for stainless steel tanks (35 mm & 120 mm are standard - unless your tank is not a manufactured standard tank these lids should fit.
Hope this helps!