is it fixable or do I need a new toilet?

I have a foot pedal flush system on a low profile toilet. Where the water line feeds into the bottom, back of the toilet blew out and flooded the bathroom. Upon further investigation, using a flashlite and mirror, {because I couldn't get my head back in there to see} I found, what I guess to be a pressure fitting connection. The L shaped piece of plastic has no threads and just fit into the opening at the back of the toilet and the other end was threaded and screwed into the water supply line. Anybody out there have this same problem. This is on a 1986 Yellowstone Ceville Model. Thank you.