Y Strainer Gasket

Then go ahead and order them.

There are plenty of suppliers of the item just waiting for your call, Marshall Excelsior and Sureflow are just two that come to mind.

Dear Spades I need to know gasket size for strainer cover no for flange connections. gasket size of strainer cover is different from flange connection.

Measure it/them. If the dimensions match a standard flange gasket size, you can order from many sources. If not, you may need to order from the Y-strainer manufacturer according to their parts list.

just make new ones

Bonnet gaskets are usually specific, get the manufacturer, size and class, contact the manufacturer or supplier and they will either give you a drawing or tell you the size, then order them from your prefered supplier.

CR4 offers neither permission nor training of the use of the telephone for these things, for this is in the original poster's domain. Go for it; "Nike" (usual disclaimer).