I just bought a pedal operated sandblast gun to update my harbor freight one. First off I bypassed the foot pedal because I did not have enough hose and wanted to see how it would perform. Hooked it up and it refuses to suction any media. I adjusted the needle depth, nothing. I adjusted siphon valve, nothing. Cleaned hoses, nothing. Put old gun back on and works as usual. I looked at a video of the style I have and a parts breakdown, mine has no O ring inside so I'm wondering if this thing is a Chinese piece of junk missing parts. Pic attached is similar. Any ideas? thanks
