Circular Hole Punch Knockout Die 20mm / 22mm - Stainless Brewing Tool

A knockout die that punches a perfectly round hole through plastic buckets, lids and thin stainless — the clean way to add an airlock grommet, a tap or a thermowell to any vessel. Drill a small pilot hole, insert the bolt, tighten with a spanner, and the die shears a factory-clean circle.

Two sizes: 22 mm for standard taps and larger grommets, 20 mm for airlock grommets and smaller bulkheads. No ragged drill holes, no cracked lids, no deburring — the punched edge is smooth enough to seal a grommet straight away.

Key features

• Punches clean round holes in plastic and thin stainless
• Two sizes: 20 mm and 22 mm knockout dies
• Shear-cut edge — grommets and bulkheads seal first time
• No cracking, no melting, no deburring
• Turn any bucket into a fermenter

Usage

• Drill a ~10 mm pilot hole, feed the bolt through, thread on the die and tighten until it shears
• Pair the hole with a silicone grommet for an instant airlock port
• Use a step drill for the pilot hole in stainless

Quick facts

• Sizes: 20 mm / 22 mm
• Punches: plastic, thin stainless
• Type: bolt-driven knockout die
• SKUs: KL10825 / KL10832

Related products

• HSS Step Drill 4-22mm
• Tube Cutter 2-in-1
• RED Mini Tube Cutter
• Fermentation Bucket 10L
• 3-Piece Airlock