Does anyone know if this will fit on any Laing D5 pump? According to Laing site they only make one model. Seems Koolance just upped the voltage to get more head pressure. I am concerned about the threading though. Not for the fittings but, for the piece itself as it is srewed on. Ordering from Performance-pcs and Hank is not to nice about returning things. If I did not have a couple of varios already I would just get the Pmp 450 that it's made for but to much $. Thanks in advance if anyone can help clarify.