Im probably gona get flamed for this but been "thinking" about fitting a dump valve. There seems to be loadsa different types and they all vary in sound and loudness. Im not looking for the 'hiss' or 'pshhh' noise but the ones that make a 'whistling' noise. Like a 'high pitched hiss that whistles'. LOL, Its hard to describe.
If anyone knows what Im on about, let us know which Dump Valves make this sound.
>Gets ready for flame posts...
Cheers.