I have 3 questions. I am installing a sink only drain in a garage to a cesspool system. I am placing it under the slab and core drilling through the foundation block. My first question is do i need a sleeve through the concrete block? my next question is can the pipe exit upward through the slab poured in the concrete or do I need a sleeve here also? My third question, is 2.5 inch pipe large enough or is there a minimum size required. thanks for any help.
2″ is ok as long as your code goes along with it. After you get outside use 3′ pipe to cesspool and put a CO. every 50′. Also run a vent through the roof. Check your code for vent size here you could use 1-1/2″ up to 18″ below roof and increase it to 2″ through roof.