Cold Plunge Cover for Rubbermaid 100 Gallon Stock Tank, Insulated Ice Bath Lid with Locking Clips, Marine Vinyl Review (2026)

Built for one specific tank

This lid is cut to match the Rubbermaid 100 gallon stock tank, one of the most common tanks used in DIY cold plunge builds, and measures roughly 53 by 32.5 inches to match that tank's oval opening. Because the fit is tank-specific, it will not work on round ice bath pods, smaller or larger stock tanks, or tanks from other manufacturers with a different rim shape, so buyers need to confirm their exact tank model before ordering. The listing describes it as fitting both a standalone tank sitting on the ground and a tank built into a wooden frame, which covers the two most common DIY setups people use for backyard cold plunges.

Marine vinyl construction

The cover is made from marine-grade vinyl, the same category of material used on boat seating and outdoor spa covers, chosen for its resistance to UV exposure, rain, and general outdoor wear over a full season rather than just a few months. Marine vinyl is also easier to wipe clean than fabric tarps, which matters for a cover that sits near standing water and is exposed to dirt, leaves, and pollen between plunge sessions. The insulated build is intended to help slow heat gain into the water when the tank sits outside in the sun, though how much difference this makes depends heavily on ambient temperature and how often the lid is removed.

Locking clips for security

Four locking clips secure the lid to the tank rim, which serves two purposes: keeping the cover from blowing off in wind and adding a layer of protection against curious pets, wildlife, or small children accessing standing water unsupervised. This is a meaningfully different approach from a simple draped tarp, since a locked lid takes intentional effort to remove rather than just lifting off. Anyone with young children or pets around the plunge area should still treat locking clips as one layer of safety rather than a substitute for active supervision, since no cover eliminates the risk of open water access entirely on its own.

Living with a rigid lid

Because the cover is a rigid, fitted piece rather than a soft roll-up tarp, it needs somewhere to lean or rest while the tank is uncovered during a plunge session, which is worth planning for in tight patio or garage spaces. Some DIY plunge owners store the lid against a nearby wall or fence, while others prop it against the tank itself, so this is more of a layout consideration than a defect in the product. The rigid build is also part of why it holds its shape and resists sagging under rain or light snow better than a flexible tarp would over a full outdoor season.

Who should buy it

This cover fits people who already have or are building a cold plunge around a genuine Rubbermaid 100 gallon stock tank and want a purpose-fit, lockable lid instead of improvising with a tarp and bungee cords. It is a poor match for anyone using a round inflatable ice bath pod or a stock tank from a different brand or size, since the fit will not carry over. For the intended tank size, the combination of a tailored fit, weatherproof marine vinyl, and locking security covers the main things people look for in a stock tank cold plunge lid.

Frequently asked questions