maybey a mail to maxum would help......
the one i had originally in my 2400 sc3 (2009) but took it out because i needed the space for something else comes from:
Sanitation Equipment Limited
35 Citron Court, Concord, Ontario, Canada, L4K 2S7
Parts & Service (905)738-2467 Fax (905)738-2483
the tipe is VISA MSD, and it's US coast guard certified (type 3)
you can install it on the holding tank or on the thru hull discharge fitting