Or a little less at ronayers.com. A little more at servicehonda.com. Just a bit more at Babbit's. Those are my top 3 choices for online parts. (Servicehonda usually has the slowest delivery.) All three have good fiche systems though Ron Ayers' can be frustrating because the links line up a little high on their website. (Read the hyperlink preview -- if your browser give one -- before clicking.)Not sure where you are from but they are not that expensive. For an ACE the part # is 16950-MAH-023. Comes with a filter too ...
16950-MAH-023 PETCOCK ASSY. $56.35
Added note: when I check the fiche files, I get the part number as 16950-MAH-013 selling for $55.84 @ Ron Ayers. Service Honda & Babbitt's show the part number as -023. All three are using the same image.