PETKIT PuraMax 2 Leaking Urine? The $149 Fix
The short answer: PETKIT sells a replacement cylinder for the PuraMax and the PuraMax 2, and the company’s own description of that part is the most useful sentence in this story. The $149 Cylinder Max is listed as “an upgraded leakproof cylinder” whose “patented brim structure efficiently guides urine to the high-performance litter pad”, with a “seamless ShieldBase” that the listing says “ensures exceptional leakage prevention”. A manufacturer does not tool a second cylinder for a box that does not leak.
Owners in r/PETKIT describe three versions of the same complaint. One cat stands to urinate and the urine leaves the box somewhere. One leak appears only when the drum rotates to scoop. One pools in the tub underneath the drum. petiqlab read those threads, PETKIT’s store catalogue and a hands-on review from cats.com on October 3, 2026, and petiqlab has not tested this litter box. The useful question is not whether a PuraMax 2 can leak, because the company’s own parts shelf answers that. It is which of the three you have, because that is what decides where your money goes next.
What an automatic box is supposed to do with urine
A drum-style litter box rotates a lined cylinder so that clumps fall through a screen into a waste drawer, and the liner is the seal. PETKIT describes the $36.99 replacement pad for the original PuraMax as scratch-proof, waterproof and anti-stick, with the waterproof surface there to stop liquid from “seeping through to the bottom”.
That arrangement holds when the pad is seated tight against the drum wall and the cat urinates onto the litter. It fails in two situations. The pad edge lifts or the pad has aged, and urine runs between the liner and the drum. Or the cat aims above the liner, so the urine hits the wall of the drum rather than the litter.
PETKIT’s newest box shows which of those two the company keeps solving. The Purobot Max 3, listed at $399.99, is advertised with a “patented 360° ShieldBase Leak-Guard” that “stops edge leaks”. Edge is the word that matters. A rotating drum always has an edge, and each generation of this design arrives with a new answer to it.
The three leaks owners traced
Four of the reports below come from r/PETKIT threads about the PuraMax 2, and the fifth is from a Purobot Max Pro 2 owner in the same subreddit. All five are linked in the table.
| What the owner reported | Where the urine ended up | What was done about it |
|---|---|---|
| Cat stands to urinate (1p6y5cl) | “leaks out somewhere”, with urine collecting in the tub below | the box was new, and the owner asked whether this was normal |
| Urine runs down the wall beside the air purifier (1r522m0) | at the ring that holds the purifier, outside the drum | owner taped around the whole circle holding the purifier and reported it worked |
| Leak appears when the drum flips to scoop (1pt9ljo) | below the pad, pooling on the main body | nothing reported, from a box owned since July |
| Same pattern in a three-cat household (1ilctkf) | “a lot of urine leak below the pad” | nothing reported, and the box otherwise worked |
| Cat urinates onto the camera window on a Purobot Max Pro 2 (1uuooy7) | inside the drum, onto the camera opening | owner removes the drum and cleans it every time it happens |
The tape repair is the most interesting item in that table, because in theory it is the same fix PETKIT sells in hardware. The owner closed the gap between the drum wall and the purifier mount, which is a brim problem, and the $149 Cylinder Max is sold as a replacement brim for the same pair of models. petiqlab cannot say whether the paid part and the tape address the same gap on the same box, and one owner’s roll of tape is one owner’s box.
Notice also that none of the five reports describes a leak out of the waste drawer. On this design the drawer is sealed and locking, and the failures concentrate around the liner’s edge and the drum wall. That matters if you were expecting the leak to be a bag problem.
What PETKIT sells for this problem
| Part | Official list price, October 3 2026 | What PETKIT says it does |
|---|---|---|
| PuraMax 2 Cylinder Max | $149.00 | “an upgraded leakproof cylinder for PURAMAX and PURAMAX 2”, a “360° seamless structure”, a patented brim that guides urine to the pad, and a seamless ShieldBase |
| High Performance Cat Litter Pad, PuraMax | $36.99 | scratch-proof, waterproof and anti-stick cylinder mat, 16 x 15.7 x 0.8 inch, sold as a replacement |
| Cat Litter Remover, PuraMax | $29.99 | dumps “approx 90%” of the cat litter with one click, so you stop lifting the whole cylinder out |
| High Performance Cat Litter Pad Max 3.0 | $39.99 | pad and upgraded cylinder together “prevent urine leakage within the automatic cat litter box” |
| PuraMax Fence | $12.99 | a barrier for the entrance |
Two lines in that table deserve a second read. The cylinder costs $149, and one Chewy customer put the box itself at $600 in a review dated March 2025, which makes the leak answer roughly a quarter of the machine. The pad is $36.99 and it is a wear item, which means the seal that keeps urine out of the electronics is something you buy again. Neither number is unusual for smart pet hardware, and both are worth knowing before the first drip rather than after it.
The parts are also the reason this model still has a future. petiqlab read PETKIT’s store catalogue on October 3, 2026, and it listed 90 products. Seven of them are litter boxes, spread across the Purobot Ultra, the Max 3, the Max Pro 2 in two configurations and the Crystal Duo in three. The PuraMax 2 box is not among them, while its parts shelf is, including everything in the table above plus trash bags. A catalogue read is not a discontinuation notice and PETKIT’s PuraMax 2 product page would not load for petiqlab on that date, so the honest reading is that the accessories outlived the listing rather than that the model was cancelled. Either way, a repair plan that depends on a part you can still order is a better position than one that depends on a part nobody sells.
The reviewer whose unit never leaked
PETKIT’s own parts list says the leak exists in the design. What it cannot tell you is how often an owner will meet it, and that is where a hands-on test earns its place. cats.com tested the PuraMax 2 and scored it 3.8 out of 5 overall, with cleaning at 3 out of 5 as the weakest category. Its verdict on the leak itself was the opposite of the threads above, and it is worth quoting in full because a leak complaint sounds different when a tester cannot reproduce it.
The leak-proof technology also worked well for me, and held up even when my cat urinated a large amount at the very back of the liner.
Read the rest of that review and the two views stop contradicting each other. The same page states that most negative reviewers on the product “comment on either urine leakage, technical malfunctions such as the sensors not working properly, or the size of the litter tray”. A single unit tested over weeks is one cat, one posture and one pad seated correctly on the day it was installed, and a leak rate is a population. The reviewer is describing her box. The owners are describing their boxes, and among them one cat that stands to urinate is enough to break the seal.
The rest of that review is the part a buyer should read before spending anything. The deep clean was the worst experience the tester has had with an automatic box, because emptying the drum needs the magnetic litter remover and PETKIT’s own estimate of what that piece recovers is 90% of the litter. Her result went the other way.
the PuraMax did the job more poorly than any other automatic litter box I’ve tried, while taking much longer to empty
She gave up after two attempts and finished the job with a vacuum, then noted that the waste bags shipped with the box are unusually sturdy, which is a real compliment on a job she hated. The box also needs hard floors rather than carpet or a mat, and on carpet she turned the automatic scooping off as a safety precaution, which left the weight sensor inaccurate.
The buyer reviews on that page add the size problem to the list. A Chewy customer who paid $600 wrote that her cat poops outside the box because he does not fit, and said she does not recommend it for larger cats. That is consistent with what this site has found across the category, where entry width and interior room matter more than the marketing copy, and it is covered in the guide to automatic boxes for large cats. A second reviewer wrote that his unit would not sense a cat and clean on its own, leaving him to trigger cycles from his phone, which he called a defeat of the purpose to have a self-cleaning box.
On the brand as a whole, Trustpilot showed petkit.com at 3.7 stars from 327 reviews when petiqlab read it on October 3, 2026, up from 3.6 from 304 reviews on September 23, 2026. That score spans fountains, feeders and boxes, so it is background rather than a verdict on this machine. The site’s own Eversweet 3 Pro review covers the PETKIT device this site does recommend, and the parts culture described there is the same one you see in the table above, with pumps and pads sold as separate items.
Five checks before you buy a drum style box
- Watch your own cat urinate before you order anything. If she stands, or if she has ever sprayed a wall, the drum designs are the wrong family of product and the Litter-Robot leak write-up shows the same story from another brand. The leak arrives on the outside of the drum, and the fixes owners find are improvised.
- Price the pad as a consumable, not an accessory. The seal that keeps urine away from the electronics is a $36.99 item on the PuraMax and a $39.99 item on the newer pad, and a worn liner is one of the two ways the seal fails.
- Match the cat to the opening and the interior. A $600 box that the cat cannot turn around in produces the complaint you can never fix, and the review notes that the tester’s larger cats ignored automatic boxes entirely.
- Check the floor. Carpet, a rug or a litter mat puts the box outside its designed conditions, and the safety workaround in that situation, switching off automatic scooping, costs you the weight sensor’s accuracy.
- Check that the model’s parts are still sold before the leak starts. This is the one check the PuraMax 2 passes, since the cylinder, pad, remover and fence are all listed while the box itself is not. Parts lines end quietly, and a drum is the kind of part you cannot improvise.
What to buy instead
If your cat stands to urinate, no drum-style box is a safe recommendation and this site will not pretend otherwise. A high-sided standard box costs a fraction of the price, has no liner to seat and cannot leak into its own electronics. What “automatic” costs you, and the cases where a plain box is the better purchase, are covered in the smart litter box guide.
If your cats urinate normally and you still want automation, petiqlab’s standing pick in this category is the PETKIT Purobot Max Pro 2 (B0DFYLFFG1 on Amazon), listed at $499.99 on PETKIT’s own store with the Fence 2.0 included as of October 3, 2026, and it carries a two-year standard warranty with no subscription attached to the machine. Two disclosures belong with that recommendation. The camera-equipped version records clips for a trial period and then shows live video only, so buy it for the drum and not the camera. And one owner in the threads above reports a cat urinating onto the camera opening on a Max Pro 2, which is the same posture documented in this article and not fixed by a different model.
Before any drum purchase, read the adaptation notes in the cat refusal write-up, because a box the cat refuses is more expensive than a box that leaks. And if you already own a leaking PuraMax 2, the cheapest test costs nothing. Lift the pad, look for urine staining between the liner and the drum wall, reseat the liner tight, and watch the box for one scoop cycle. If the leak follows the pad edge, you are looking at the part PETKIT sells. If it follows the cat’s posture, you are looking at the wrong box.
FAQ
Does a leaking PuraMax 2 mean the box is defective?
Not necessarily. The liner on a drum box is a wear item and the manufacturer sells replacements for it, which means a leak can be a maintenance event rather than a fault. The pattern that suggests a fault rather than wear is a leak that appears on a new box, or one that returns immediately after a new liner is seated. Of the reports read for this article, the new-box leak came from a cat that stands to urinate, which is a design limit rather than a defect.
Is the tape fix better than buying the $149 cylinder?
The tape is cheaper and one owner reported it worked, but it is a single report on a single box, and petiqlab has not tested either approach. Taping a seam near an electrical housing is also the kind of repair that can trap moisture, which no owner in these threads reported either way. If the leak is at the purifier ring and the pad is sound, the tape tells you where the gap is, and that information is worth having whether or not you then buy the part.
Why does the leak only show up during scooping?
Because that is when the drum tilts and any urine that has collected at the wrong place gets a direction to travel in. An owner in one thread put it as leaks appearing “when it starts to flip for scooping”, and a second owner found liquid pooled under the pad after cycles. A leak that appears on every cycle points at the liner’s edge, while a leak that appears once a day points at how the cat uses the box.
Should I use crystal litter in a PuraMax 2?
No. The review at cats.com states plainly that the box does not work with crystal litter, and PETKIT ships two sifters for clay granules and for longer particles such as tofu litter. Using a litter the machine was not built for changes how the screen handles clumps, and the sifter is the part doing that work. This is separate from the leak advice, and worth checking before you buy a box, because a sack of the wrong litter is a $20 mistake that makes the machine look broken.
How often should the liner be replaced?
PETKIT does not publish a replacement interval, and neither the store listing nor the review gives a service life for the pad, so petiqlab will not invent one. The practical test is physical rather than calendar based. A liner that has lost its tight fit at the edge, or that shows urine staining underneath it, no longer does the job it was installed to do, and the $36.99 part is the correct response at that point rather than a new liner on a schedule.
Is a cheaper automatic box less likely to leak?
Price is not the variable, posture is. The leak paths in this article come from urine reaching the drum wall above the liner, and that happens on expensive and inexpensive boxes alike, including the Litter-Robot reports this site has documented. What money buys is the response, including whether the liner and the drum are sold as separate parts, how long the warranty runs, and whether you can buy the fix without shipping the whole machine back.