The pump identified by TheSoaker appears to be made by Táizhōu Water Source Environmental Protection Equipment Technology Co., Ltd
. To me, it looks like a generic version of the SeaFlo
brand, which is made by Xiamen Huiliyuan Imp. & Exp. Co., Ltd. I like the SeaFlo version because the motor appears to be TENV (Totally Enclosed Non-Ventilated), whereas the generic ones appear to have an ODP (Open Drip Proof) motor (in some eBay sellers' photos, you can see the motor windings). Even if the SeaFlo version is not actually TENV, it's certainly protected from water better than most copycats.
If you click on the SeaFlo link above, you'll notice model SFDP1-011-070-21 of this version comes with it's pressure switch set at 70 PSI, and it can be set as high as 80 PSI for "OEM/ODM service". The pressure switch looks like it's the same as the one on the next larger pump (Series 22
). If that's true, it could be set at up to 120 PSI. I'm willing to bet the generic ones are the same as model SFDP1-011-070-21, but with the pressure switch set at 100 PSI. For intermittent service on a water blaster, we can probably get away with 100 PSI on the SeaFlo SFDP1-011-070-21, but I'll confirm with the manufacturer.
So far, I've only been in touch with SeaFlo's sales office in China. Communication is a bit shaky, but I was able to get them to send me a 3D model of the pump (screenshot below) to incorporate with my 3D assembly. Now, I have a contact for the US SeaFlo sales office and will seek further information through that channel.