Using ISO 32 and had one pump replaced by Power Pole due to leakage. I think it has "Monster" something on it. I'm not well versed on these. They are older models I believe. I will look closer at them when I get home to be more informative. I'm fairly certain that these have not been maintained well by the previous owner, from the condition of the rest of the boat when I bought it. They worked fine for a few months when I purchased it last year tho.