Rivera Primo SU Sportster KIT 1041-0064 - Manual (Page 14)

Su Carb installed less air cleaner assembly.
Installing the air cleaner starts with the installation of the
straight hose connector (1101-0005) into the air cleaner
backing plate. The backing plate comes with the rubber
grommet already installed with a red plastic cap (if you
choose not to use the breather system leave the cap in
place).
Next, install the straight hose connector (1101-0005) into
the back of the backing plate..
First remove the red cap from the grommet.
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