Pro-grade equipment to manage pressure has filtered down to the homebrew and nano scale, and these two units will get you spunding with style.
Ss Brewtech Sspunding Valve Adjustable PRV
$119.95–$179.95, ssbrewtech.com/products/sspunding-valve
Two models offer varying levels of convenience—if cost is a priority, the non-scaled version will get you into the game safely at a lower price point. Or, splurge on the scaled model for direct pressure measurement and the handy quick-depressurizing plunger. For tanks over 3.5 bbl, try the pro model.
Spike All-In-One PRV
$150, spikebrewing.com/products/all-in-one-prv
Don’t leave safety to chance when fermenting under pressure. The Spike All-In-One PRV combines features you’ll want, like the pressure blow-off plunger, with the reassuring and familiar precision of a pressure gauge. Includes a gas post on the back for double duty in pressurized transfers—a nice efficient and simple touch.