Pos-T-Vac Mach Ring 7 – Large Tension Ring (10.5 mm)

The Pos-T-Vac Mach Ring 7 is a large (L) replacement tension ring with an inside diameter of 10.5 mm (0.43"). Mach Rings have a thick center that spreads tension evenly over a wide area for comfort.

Fit and compatibility

• Size: 7 (Large), inside diameter 10.5 mm (0.43")
• Mach sizes run 5 (smallest) to 8 (largest): 6.5, 8.6, 10.5 and 13.5 mm
• Latex-free
• Loads onto the cylinder with the Pos-T-Vac ring loading cone

For use with Pos-T-Vac vacuum therapy systems, including:

• Pos-T-Vac BOS-2000 (2-battery)
• Pos-T-Vac MVP 700 (manual)
• Pos-T-Vac Automatic 3000 (3-battery)

When to replace

A Mach Ring keeps adequate firmness for about 30–40 uses. Replace it sooner if it stretches, tears or no longer holds tension.

Safety: Do not leave a tension ring on for more than 30 minutes. Read the user guide that came with your system before use.

Sizing tip

Manufacturer and MedlinePlus guidance: start with the largest comfortable inside diameter and size down only if needed. Do not leave a tension ring on for more than 30 minutes. Replace rings every few months as they lose elasticity.

Paying with an HSA or FSA

This tension ring may be eligible for purchase with an HSA or FSA when it is used with a vacuum therapy system to treat erectile dysfunction. Many plan administrators ask for a doctor's prescription or a letter of medical necessity, so please check with your plan before you order.

Need an itemized receipt? Your order confirmation already lists each item, and we can email you a copy anytime — just ask.

Educational video. Not a substitute for medical advice. Talk with your doctor before starting vacuum therapy.