Surprising Insights: Compared Power Washer Pumps for Honda When we ventured into replacing our Honda GX340’s power washer pump, we weren’t prepared for the sheer variety of options. After thorough research, the 4000PSI 4.4GPM triplex plunger pump stole the spotlight for its compatibility with Honda engines like GX340, GX390, and GX270. What impressed us most was its 1-inch shaft and direct drive design, ensuring seamless integration with our existing setup. The pump’s performance, delivering 4000PSI and 4.4GPM, felt like a game-changer—cleaning efficiency was noticeably higher than our old unit. The included five nozzle tips added versatility we hadn’t anticipated, making tasks like garden cleanup and siding washing a breeze. Though the initial cost seemed steep, the durability and precision outweighed any hesitation. In our comparison, this triplex pump stood out for its balance of power and reliability. It’s one of those upgrades that quietly elevates the entire machine, making us wonder why we didn’t find it sooner.