Hey, I have the Illadelph bubbler in green and I was considering the purchase of a hot hit slide. My slide that came with the piece is a 14mm slide but I was wondering if I could get a 18mm hot hit slide? Is it just a matter of increased airflow between the 14mm and 18mm size slides? Also, if anybody knows where I could find a Illadelph stackable disc ash catcher in green or the hot hit set in green (2 rods, stand, slide, illadelph box) that would ship that would be fantastic. Thanks.