gen1 fuel filter(s)

[ptolemyx]

As well as the fuel filter between the tank and fuel pump should there be what looks like a fuel filter between the fuel pump and carb's? I've good flow to the offending article and poor flow out of it????? If it's an auxiliary filter will I be okay to bypass it or is it some kind of check valve - doesn't seem to be a one way valve just poor flow blowing through it in either direction. I think a previous owner may have fitted it??? Pic shows the item in the hose between pump and carb's (temporary routing whilst working on the bike):-