The International Code Council did indeed appoint a representative of ASPE to the Plumbing Code Committee.
ASPE resubmitted their change to add a single stack venting system to the code. Last year, the change was rejected because the Committee believed there were already enough venting options in the code. It failed to pass by nine votes at the Annual Meeting. ASPE pointed out in the code change that the other two model plumbing codes - IAPMO Uniform Plumbing Code and the PHCC National Standard Plumbing Code - have requirements on single stack venting systems. Only the IPC has not accepted the code change. Another change that was submitted by ASPE addresses secondary drainage for a storm drainage system. A similar change was submitted to the IAPMO Uniform Plumbing Code and accepted in that code.