Versus Simpson: Yamatic Triplex Showdown—Surprising Toughness Compared! We recently swapped out our Simpson AAA 90034 pressure washer pump with the YAMATIC Horizontal Triplex model, eager to test its longevity against its counterpart. After months of heavy use on industrial-grade washers, we’re impressed by how our Yamatic pump holds up. Unlike Simpson’s, ours delivers consistent 4000 PSI power with a smooth 3.5 GPM flow, even when running on Honda GX340 engines. The build quality feels robust, with fewer leaks or wear compared to our old setup. While compatibility with Honda motors has been flawless, we did notice our wash times remain efficient. It’s not just about matching specs—it’s about reliability on the jobsite. So far, our Yamatic Triplex delivers, and we’re considering switching other washers for this reliable option.