I think my anti siphon valve is beginning to fail. According to what I've read, the aluminum ones, even 3/8 x 3/8, are for motors up to 200hp and brass ones are for motors over 200 hp. My current one is aluminum, the boat originally had a 150hp on it but now has a 200hp. I've used the aluminum with the 200 for two years with no problem, I only just found out there is a difference. I bought an aluminum one before I realized there was a difference. Is there any possible damage I could do to the motor using the aluminum one or should I get a brass one.