Have any fellow plumbers come across this type of fill valve before? It’s in one of those awkward toilets which is completely inaccessible ie no access to the close coupling bolts or inlet connections because of the style, though it it a close coupled type. My apologies for the poor photo but it the writing looks like “Idrols” (not Ideal). I’ve scoured Google images and can’t find a match. It appears to have a locking nut on the main body (like the fluidmaster). Thanks.