If your penis is larger than average, the Bathmate X40 is designed to give it an extra boost. The X40 hydrotherapy penis pump uses water instead of air for better results and offers 35% more power than it’s predecessor, the Hercules. This penis pump can be used in the bath or the shower for easy incorporation into your regular routine. This pump fits men with maximum erect penis lengths of up to 28 cm and girths up to 19.5 cm. It’s 15% bigger than the X30 and has extra features like a Super Flow Valve System for single-handed use as well as a Swivel Bellows feature for 360 degree rotation.