Puroma Combination Lock Review: Cheap, and Actually Weatherproof

Combination locks left outdoors — on a shed, gate, or toolbox — often rust or seize within a season. This one is specifically built to hold up where a basic indoor lock wouldn't.

Who it's for

This is built for anyone locking something outdoors on a regular basis — a garden shed, a chain-link gate, a bike rack, a gym or pool locker — where a basic indoor combination lock would corrode or seize within a season. It's not the right choice if you're securing something genuinely valuable in a high-theft area (a motorcycle, a storage unit full of tools); for that, a hardened steel disc lock or a keyed padlock rated for security, not just weather resistance, is the better call.

What we liked

• Weatherproof construction holds up to outdoor exposure without the dial seizing up, a common failure point for cheap locks.
• Resettable 4-digit code lets you set your own combination instead of being stuck with a factory-assigned one.
• Two-pack covers a shed and a gate, or a locker and a bag, without buying separately.

What could be better

• A basic combination lock isn't high-security — fine for deterring casual theft, not for protecting genuinely valuable property.
• The dial mechanism is small; setting the combination takes a careful first pass to get right.

Key specs, explained

The alloy steel and zinc construction is what makes the weatherproofing possible — zinc plating resists the surface rust that eats through cheaper carbon-steel shackles after a few rainy months, while the alloy body keeps the shackle from bending under a sharp pry attempt. Resettable 4-digit combination means you set your own code by holding the shackle and dialing a specific sequence (check the included instructions), rather than being stuck with whatever code the lock shipped with — worth doing on day one, since factory-set combinations for this style of lock are a known common default across brands.

Frequently asked questions

Q: How do I reset the combination to my own code? Hold the shackle down in the unlocked position, which exposes a reset mechanism on the back of the dial (check the included insert for the exact button or lever, since it varies slightly by production run), dial in your new 4-digit code, then release the shackle to lock in the change.

Q: Will the weatherproofing hold up through winter, not just rain? The zinc-plated shackle resists rust from moisture, but like any dial-based lock, extreme cold can make the mechanism stiffer to turn — a light application of a dry lubricant (not oil, which attracts grit) before winter keeps the dial turning smoothly.

Q: Is this lock TSA-approved for checked luggage? No — this is a general-purpose combination padlock, not a TSA-recognized lock, so a TSA agent may cut it off during an inspection if used on checked baggage.

Should you buy it?

For lockers, gates, sheds, or gym bags, this is a reliable, affordable lock that actually survives outdoor use — where a lot of cheap combination locks quietly fail after a few months.

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