The big brother of the Race Rocket, the HPX offers the same features in a longer package with even more impressive results. It’s not just the barrel, even the hose is longer. This makes for a more efficient stroke – bigger really is better – and the extra hose length makes it more convenient too.
Otherwise it’s the same excellent rubber grip, wide shaft, smooth, true stroke and secure rubber seals each end to keep the muck out of the workings. The screw-on head is secure, and while slower to engage than a push-on chuck, the seal is better and there’s no chance of the chuck being pushed off.
Though 63psi will get you home, at 200 strokes we hit 80psi and it was still going. Stroke length was 19cm.