GRELWT Chain Link Fence Post Extender, 2 3/8 Fence Extensio

The Verdict

If you need more privacy, want to keep deer out of a garden, or just need to run another row of chain link above an existing fence, the GRELWT post extender is the kind of product that saves you from a weekend of digging post holes. The concept is dead simple: instead of pulling the old posts and pouring new concrete, you slip this 2-3/8" extension over the top of your existing posts and bolt it down. No concrete bag math, no post hole digger, no re-tensioning an entire run of fencing from scratch.

What you actually get in the box: one galvanized steel post extender (the listing offers various heights, so confirm your needed length before ordering), plus all the mounting hardware — bolts, nuts, and washers sized to fit the pre-drilled holes. The steel is heavy-gauge and the welds are clean, which matters more than you’d think. Cheap extenders flex at the seam and eventually sag under chain link tension; this one doesn’t.

The install process is straightforward but honest about its limitations. You slide the open end over your existing post, line up the bolt holes, and torque it down. As one reviewer put it: “Took about 15 minutes per post once I figured out the alignment trick.” That trick, for the record, is to loosely thread the bottom bolt first, then rotate the extender to line up the top holes. Doing this alone on a ladder is doable but fiddly — the extender wants to spin while you’re trying to thread bolts. A second pair of hands makes it dramatically easier, and if you’re working on a full fence line, plan for roughly 20 minutes per post.

What buyers consistently praise: the build quality and the fact that it actually fits standard 2-3/8" posts without slop. Multiple reviewers specifically noted the galvanized coating is thick and even — no bare spots that will rust through in the first season. One customer mentioned they’d already had a cheaper extender fail after a winter storm, and swapped it for this one: “Night and day difference in thickness. The old one bent, this one didn’t flinch.”

Where it falls short: this is not the product for corner posts or end posts under heavy tension. If you’re extending a fence line that terminates in a corner, the structural load on that extender is significant, and several reviewers noted the bolts can shear under extreme tension. It’s fine for line posts and gate posts with moderate tension. Also, the pre-drilled holes are fixed — you can’t adjust height incrementally beyond the bolt hole spacing, so measure your needed extension carefully before ordering.

Who should buy this: homeowners adding 12-24 inches of height to an existing chain link fence for privacy or pet containment, and anyone who’d rather spend $20-30 per post than $80-100 per post on full replacement. Skip it if you’re dealing with a heavily rusted existing fence (the extender is only as strong as the post it attaches to), or if you need to extend a corner post under heavy tension — in that case, bite the bullet and replace the post properly.

FAQ

Will this fit my 2-3/8" post? Yes, if your post measures 2-3/8" outer diameter — that’s the standard for residential chain link. If you have commercial 2-7/8" posts, this won’t fit. Measure before ordering.

Can I install this alone? Physically yes, but it’s frustrating. The extender is heavy enough that holding it, aligning holes, and threading bolts one-handed is annoying. A helper or a clamp to hold the extender in place will save you significant swearing.

Does it come with all the necessary hardware? Yes — bolts, nuts, and washers for both connection points are included. The hardware is decent quality, though if you’re in a coastal area, you might want to swap in stainless steel bolts for extra corrosion resistance.

The Verdict

The GRELWT chain link fence post extender does exactly what it promises: it raises your fence height without the back-breaking work of replacing posts. It’s well-built, properly galvanized, and priced fairly for what it is.

Buy it if: you need to add height to an existing chain link fence on line posts, and you’re comfortable with a moderately fiddly DIY install.

Skip it if: you’re extending corner or end posts under heavy tension, or if your existing posts show significant rust at the top — you’d just be bolting new steel to failing steel.

Rating: 4.6/5 — A solid, honest product for a specific job, with the only real downsides being install awkwardness and structural limits on high-tension applications.

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.