Tank Body, Pentair PacFab FNS, 60 sqft

The Verdict

If your FNS Plus filter tank has cracked, spider-webbed, or started weeping water at the seam, you’re looking at the exact replacement you need. This is the genuine Pentair PacFab FNS 60 sqft tank body — the shell that houses your filter cartridge — and at 4.5 stars from 225 ratings, it’s clearly doing its job for most pool owners. But before you click buy, understand what you’re actually getting.

What’s in the box

You get the tank body itself (the main housing), the top clamp ring that secures the lid, and the lid O-ring. That’s it. As shown in the product image, there’s no internal standpipe, no filter cartridge, and no lid — just the three fiberglass-reinforced plastic components that form the outer shell. The tank measures roughly 24 inches in diameter and stands about 30 inches tall, sized specifically for the FNS Plus 60 square foot filter systems.

Build quality and real-world performance

The fiberglass-reinforced plastic is the same material Pentair has used for decades, and it’s proven. It handles UV exposure without becoming brittle, resists the chemical attack from chlorine and acid washes, and the molded-in threads on the bulkhead connections are clean and precise. Owners who replaced cracked tanks report the new one seals immediately with no leaks — a strong sign that the dimensional tolerances are spot-on.

One owner noted: “Replaced my 15-year-old cracked tank. The new one bolted up perfectly to my existing plumbing — same thread pattern, same alignment. Took 20 minutes.” That’s the benefit of buying OEM. The clamp ring is beefy and the O-ring groove is properly machined, so you won’t fight air leaks at the lid joint.

What buyers consistently praise

The overwhelming theme in positive reviews is that this is a drop-in replacement. Multiple buyers with FNS Plus 60 systems (and the older PacFab brand equivalents) confirm the bolt pattern matches existing base plates, and the inlet/outlet ports align with standard 2-inch plumbing. Durability also gets consistent shout-outs — owners in Arizona and Florida report no fading or warping after two full seasons in direct sun.

Where it falls short

Let’s be honest about the downsides. The price is the big one — you’re paying a genuine Pentair premium, often 30–50% more than aftermarket alternatives. If you’re on a tight budget and your old tank’s internals are still serviceable, an aftermarket shell might stretch your dollars further.

Second, the clamp ring is notoriously tight on first install. Several reviewers mention needing to tap it into place with a rubber mallet or block of wood. It’s not a design flaw — it’s a tight tolerance that ensures a proper seal — but it’s worth knowing before you start.

Third, and this trips up some buyers: the cartridge and standpipe are sold separately. If your old filter internals are worn, cracked, or missing, factor in another $100–$200 for a new cartridge assembly.

Who should buy this

• DIY pool owners with a cracked FNS Plus 60 tank who want a guaranteed-fit replacement without hiring a pro
• Long-term pool operators who prefer OEM parts for reliability over saving a few bucks on aftermarket
• Anyone with an older PacFab-branded FNS system — this tank is compatible with both branding generations

Skip it if you’re comfortable with aftermarket quality and want to save money, or if you need a complete filter assembly rather than just the shell.

FAQ

Q: Will this fit my Pentair FNS Plus 60 filter system? A: Yes, if your system is the 60 square foot model, this is the direct OEM replacement. Verify your model number — the FNS Plus comes in 36, 48, 60, and 72 sqft variants, and they’re not interchangeable.

Q: Does it come with the filter cartridge? A: No. This is the tank body, clamp ring, and lid O-ring only. The cartridge, standpipe, and lid are separate purchases.

Q: Can I use this with a non-Pentair filter cartridge? A: Technically yes, if the cartridge is the same physical dimensions (roughly 7.5" diameter, 27" tall for the 60 sqft model). But sticking with Pentair’s cartridge ensures proper fit and filtration performance.

The Verdict

Buy it if: You own an FNS Plus 60 and want a replacement that fits exactly, seals properly, and lasts another decade. The OEM premium is worth it for most pool owners who don’t want to gamble on fitment issues with a cheap import.

Skip it if: You’re on a tight budget, your existing internals need replacing anyway, or you’re comfortable with aftermarket tolerances.

Rating: 4.6/5 — Docked half a star for the premium pricing and the stubborn clamp ring on first install, but this is the tank body you want when you need it to just work.

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.