The Bathmate Hydromax 9 — historically branded the X40 — is the British company's water-based penis pump sized for users with a 7.5–9 inch erect length. Bathmate built its reputation on hydropumps that use water rather than air to generate suction, arguing that water creates a more uniform pressure profile and reduces the bruising risk that air pumps can produce. The 9 sits at the top of the standard Hydromax line; the HydroXtreme series adds a hand-pump bulb for higher-pressure use cases.

Why It Matters

At-home male sexual health hardware — pumps, traction devices, vibrating prostate massagers — is being repositioned from "novelty" to "wellness device" alongside the FDA-cleared Eddie by Giddy and the broader telehealth ED platforms. Bathmate's Hydromax line is the volume leader in pump hardware globally, and the larger sizes like the 9 reflect the brand's bet that users will graduate up the line over multiple purchase cycles.

What makes it special is the form factor and the safety valve. The Hydromax 9 is used in the shower or bath: fill with warm water, seal the comfort pad against the body, then compress the bellows to expel water and create a vacuum. A pressure-release valve at the top vents the system in a single press if the suction gets uncomfortable, which is the meaningful safety differentiator versus cheap Amazon air pumps that have caused emergency room cases for over-pumping.

What reviewers and users are saying: PrivateGym, MaleHealthReview, and ExcelMale's TRT forum all call the Hydromax 9 the "size-up flagship" of the Bathmate line and credit it for genuine improvements in erection firmness with consistent 15-minute daily sessions. Bathmate's own 2020 user survey of 12,000+ customers reported 81% saying erections were longer or harder after two months. Common pros in independent reviews: the comfort pad reduces seal pain dramatically versus the original Hydromax X-series, the bellows is easier to compress for users with limited grip strength, and the warranty is 2 years. Common critiques: the device is bulky in the shower and the price is steep at the high end of the line. The Hydromax 9 is intended only for users at or above the 7.5" length threshold — undersizing the cylinder reduces pump efficiency and can cause uneven pressure.

Price and where to buy: $399–$499 USD direct from Bathmate, with regular sales taking it to $329. Sold via Bathmate Direct, Official Hydromax Pump, PrivateGym, and licensed retailers. The HydroXtreme 9 (with hand-pump bulb) retails $50–$100 higher.

Materials and safety: Polycarbonate cylinder, food-grade silicone comfort pad, integrated pressure-release valve. CE-marked for EU sale. 60-day no-questions-asked return policy and 2-year manufacturer warranty.

The bottom line: The Hydromax 9 is the right pick for an at-home user with a 7.5–9 inch starting size who wants a water-based pump from the most established brand in the category, with the comfort-pad upgrade and the pressure valve. Anyone smaller should size down to the Hydromax 7; anyone wanting maximum suction should look at the HydroXtreme 9.

Sources

Update — 2026-05-08

Initial entry — story first created.