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A central element of isobaric brewing, the spunding valve (or adjustable overpressure valve) is the accessory that replaces your traditional airlock to actively control the pressure generated by your yeast.
While its role is always the same — venting excess CO₂ to maintain a precise pressure level — the models available on the market meet very different needs, budgets and connection standards.
From the ultra‑compact model to the professional stainless‑steel system, here is our guide to choosing the spunding valve that best fits your setup.
1. Ball Lock models: Compact, modular and budget‑friendly
If you ferment in a PET plastic vessel (such as a FermZilla) or if you use Soda Keg‑type kegs for fermentation, Ball Lock models are your best allies. They clip onto your grey/white gas post in one second.
The KegLand G2 Spunding Valve: The ultra‑compact option
For brewers who lack space in their fermentation chamber, the Ball Lock G2 Spunding Valve is a true game‑changer. Equipped with an ultra‑precise digital gauge, it takes up virtually no vertical space. Very affordable, it adjusts easily thanks to its built‑in knob and is ideal for setups where every centimetre counts.
The APRV Stainless‑Steel Model: Durable robustness
If you want the compactness of the Ball Lock format while demanding the durability of professional materials, the APRV Spunding Valve is the perfect choice. Made entirely of stainless steel, it offers excellent resistance to repeated cleaning cycles. However, be mindful of your fermentation chamber’s dimensions: this model is taller than the G2, which matters if your temperature‑control fridge has limited headroom.
The BlowTie Kit: 3‑piece versatility and “Blow Off” option
The BlowTie Kit with integrated gauge stands out thanks to its modular three‑piece design connected with John Guest tubing. This architecture offers major practical advantages:
- Ultra‑easy cleaning: Each piece can be removed independently, allowing perfect rinsing of the mechanism in case of krausen overflow. If a part becomes worn, each component can be replaced individually at low cost.
- Dual Blow Off / Spunding Valve function: Thanks to its two quick‑connect ports, you can use it as a safe “Blow Off” system at the start of active fermentation by attaching a tube that dips into a sanitiser container. Later, simply remove this second tube to instantly convert it into a classic spunding valve for the end of fermentation.
2. Tri‑Clamp (TC) models: Professional precision for stainless‑steel tanks
If you own a high‑end stainless‑steel fermenter (such as a Unitank) equipped with brewery‑standard Tri‑Clamp fittings, you should look toward heavier, more robust solutions offering surgical precision.
The complete TC 1.5" Spunding Valve Set
For a turnkey installation on your dome or gas manifold, the TC 1.5" Spunding Valve Set with gauge includes everything you need. Fully stainless steel, this monoblock kit features a clear pressure scale and a micrometric adjustment knob to fine‑tune your pressure to within a tenth of a BAR. It’s the simplest and most effective choice for stainless‑steel systems.
The custom “Wet Model” configuration: The ultimate in control
For the most demanding brewers, it is possible to separate the components to achieve professional‑grade control by combining two high‑precision pieces:
- First, the Wet Model Overpressure Valve (0–3 bar) TC 1.5". Its heavy‑spring internal mechanism offers exceptionally stable regulation, even on large fermentation volumes.
- Then, the matching 0–3 bar TC 1.5" Gauge, which connects via a tee fitting. This separation allows perfect visual pressure reading without interfering with the valve’s exhaust flow.
Rolling Beers Team Tips
Whichever model you choose, the measurement range of your gauge (its dial scale) is crucial for accurate adjustments. If you mainly ferment between 0.5 and 1.2 BAR, always choose a gauge calibrated for a low range (such as the BlowTie 0–15 PSI or stainless‑steel 0–3 BAR models). A gauge that goes up to 10 BAR will barely move at 1 BAR, making your adjustments imprecise. Choose a scale that matches your brewing routine!