13in-21in Extra Long Gas Lift Cylinder Replacement - Tall 8in Stroke

In this review of the 13in-21in extra long gas lift cylinder replacement the bottom line is simple: this is a practical, heavy-duty replacement if you need extra rise and a sturdy feel for drafting chairs or bar stools. It is aimed at users who want an extended range of adjustability - the 8in stroke and 21.85in fully extended length deliver notably more height than standard pistons. The reviewer found it straightforward to swap in for most office chairs and appreciated the steel construction and 360-degree rotation, while also noting some customers report hold and durability concerns over longer use.

Key Features

• 8in adjustable height: The piston provides an 8in travel so chairs can rise significantly higher than typical cylinders, useful for drafting or taller counters.
• Extended length: With a compressed length of 13.97in and fully extended length of 21.85in it offers a higher maximum seat height for taller users or specialty seating.
• Universal fit size: The outer cylinder diameter is 2in and the piston shaft is 1-1/8in, fitting most office chairs including many Aeron models when measurements match.
• Upgraded Class 4 build: Constructed from premium steel to meet higher industry durability standards and to provide a heavy-duty feel under load.
• Easy replacement: The unit installs with a simple base and seat assembly after removing the old cylinder, restoring rotation and height adjustment quickly for most chairs.
• High load capacity claim: Marketed to support very high loads relative to typical office cylinders, offering confidence in everyday seating situations.

Who It's For

This cylinder is best for people who use drafting chairs, bar stools, or office seating where extra height is required and who can confirm the 2in outer cylinder and 1-1/8in piston measurements before ordering. It fits users replacing worn or leaking pistons who want a straightforward swap and stronger materials than basic replacements.

It is not ideal for owners of specific incompatible lines noted by some manufacturers (for example certain flat-fit models) or those requiring an exact factory-original fit without measurement checks. If long-term hold under heavy daily use is critical, consider monitoring reports about durability before committing for mission-critical seating.

Pros & Cons

Pros

• Provides a substantial extra rise with an 8in stroke for taller seating setups.
• Solid steel construction and Class 4 specification give a reassuring build quality and feel.
• Universal dimensions make it compatible with most chairs when measurements match, and installation is simple.
• Restores smooth 360-degree rotation and adjustable height quickly.

Cons

• Some users have reported hold or durability problems after several months, so long-term reliability is not universally consistent.
• Not compatible with all brands or models; measuring the outer cylinder and piston is required before purchase.

Specifications

Our Verdict

The 13in-21in extra long gas lift is a sensible, value-oriented replacement for anyone needing additional seat height and a stronger-feeling cylinder. It works well when measurements match and provides easy installation and good function for typical use, though a minority of users report holding issues over time. Overall it is a practical choice for taller seating needs, provided buyers measure their existing cylinder and accept some risk on long-term durability.

Frequently Asked Questions

Will this fit my chair?
Confirm your outer cylinder is about 2in and piston shaft is about 1-1/8in; if so it will fit most chairs but check specific brand incompatibilities.

How much extra height does it add?
The unit adds an 8in stroke, with compressed length 13.97in and fully extended 21.85in, giving roughly 8in more adjustment range than its compressed position.

Is installation difficult?
Installation is straightforward for most chairs: remove the old cylinder with a wrench or hammer method, press the new cylinder into the base, and reattach the seat.