Web site is simple to navigate, tons of FAQs and information... I actually new what drain cleaner I needed just based on the information you have posted, a no brainier, but I contacted ClogHog anyway with my pressure washer model#, etc., and within an hour Paul D. replied and confirmed the part# I had was indeed the correct drain cleaner for my pressure washer. Can't beat that! I even beat the ship same day time (that's a plus too!). Oh and the youtube video from 2016 was also very informational. Thanks Cloghog and Paul D.