60cm Thermowell (8mm OD) with Duotight Bulkhead Fitting

• 60cm length – Fits most fermenters (27L–100L+); can be shortened if needed
• 304 stainless steel – Food-grade, durable, won't corrode
• 7mm ID – Accepts small temperature probes (RAPT, Inkbird, pocket thermometers)
• Duotight bulkhead included – Easy push-fit installation; no threads or clamps
• Pressure-rated – Sealed; works with pressure fermentation (up to 30psi)
• Reads core temperature – Probe sits in middle of fermenter, not on wall
• Professional accuracy – Perfect for repeatable batches and precise control

Thermowell:

• Length: 600mm (60cm)
• Outer Diameter: 8mm (5/16")
• Inner Diameter: 7mm
• Material: 304 stainless steel
• Weight: ~100g
  
  Duotight Bulkhead Fitting (Included):
  
• Type: 8mm (5/16") female x 1/4" BSP male thread
• Material: Polyketone (POK), colour-coded black
• Overall length: ~38.5mm
• Pressure rating: 300+ psi burst; 30psi working (with proper installation)
• O-ring: Seated, EPDM + silicone dual seals
  
  Installation:
  
• Hole size needed in fermenter lid: 8–12mm (drill or use existing hole)
• Depth rating: Use tube cutters for score line (prevents slipping under pressure)
• Compatible thread: 1/4" BSP or NPT
  
  Temperature Probes:
• Accepts probes up to 6.5mm diameter
• Compatible: RAPT, Inkbird 308, pocket thermometers, data loggers

• FermZilla or KegMenter fermentation – Accurate core temperature reading
• Precision ale fermentation – Maintain tight temp control for lager/ale profiles
• Pressure fermentation – Works under pressure; stays sealed and dry
• Cold crash monitoring – Verify when you've reached target cold temp
• Temperature controller feedback – Pairs with RAPT or Inkbird for active control
• Small fermenter use – Can be cut shorter with tube cutters for 27L–60L vessels
• Distilling wash fermentation – Monitor fermentation temps with precision
• Data logging – Use with a data logger to track temp changes over fermentation

Works With:

• FermZilla All Rounder (27L, 60L)
• KegMenter fermenters
• Any fermenter with 8–12mm drillable lid
• RAPT Temperature Controller (pair with RAPT pill probe)
• Inkbird 308 or similar (use any 6.5mm diameter probe)
• Temperature data loggers
• Pressure fermentation setups (HDPE fermenters, kegs, etc.)
  
  Temperature Probes (Compatible):
• RAPT Pill (~4.5mm diameter)
• Inkbird probes (~5mm diameter)
• Generic pocket thermometer (~6mm diameter)
• Small data logger probes (<6.5mm)
  
  Tubing (For Connections):
• EVABarrier 4mm ID x 8mm OD (fits duotight)
• EVABarrier 5mm ID x 8mm OD (fits duotight)
• Black Lightshield tubing (same sizes)
  
  Does NOT Work With:
• Probes thicker than 6.5mm (won't fit inside thermowell)
• Small fermenters (<27L) without shortening

Q: What's the difference between a thermowell and a thermometer strip?
A: Thermowell = probe sits inside, protected and dry; measures core temp. Strip thermometer = sticks outside; measures surface temp only. Thermowell is far more accurate.

Q: Will this fit my FermZilla?
A: Yes. FermZilla lids have 1/4" BSP threads; this fitting matches perfectly.

Q: Can I use this on a plastic fermenter?
A: Yes. Drill an 8–12mm hole in the lid and install with the duotight bulkhead.

Q: What temperature probe do I need?
A: Any probe under 6.5mm diameter. RAPT Pill, Inkbird, or pocket thermometer all fit inside.

Q: Can I shorten the thermowell?
A: Yes, with tube cutters. Cut to desired length and score the end so the duotight grips it properly.

Q: Is this food-grade?
A: Yes. 304 stainless steel is food-safe and used for fermentation.

Q: Does it work with pressure fermentation?
A: Yes. It's sealed and pressure-rated up to 30psi (with proper installation).

Q: What comes with it?
A: 60cm stainless thermowell + duotight 8mm bulkhead fitting + o-ring + lock nut.

Q: Why is accurate temperature monitoring important?
A: Different yeast strains have tight fermentation temperature ranges. Even 2–3°C difference changes flavour profile, fermentation speed, and final ABV.

Q: How do I install it?
A: Drill 8–12mm hole in fermenter lid. Insert duotight fitting from below. Thread thermowell through from above. Tighten nut. Use tube cutters to score the thermowell so duotight grips properly under pressure.

INSTALLATION (For FermZilla or Drilled Lid):

1. If using a drilled lid: Ensure hole is 8–12mm diameter. If using FermZilla lid with 1/4" BSP threads, skip to step 3.

2. For non-threaded lids: Insert the duotight bulkhead fitting from below (female end first). Tighten lock nut hand-tight on top.

3. Insert the 60cm thermowell tube down through the bulkhead fitting until it reaches the bottom.

4. If your fermenter is shorter than 60cm, use tube cutters to shorten the thermowell to fit (leave ~1–2cm below the liquid level).

5. IMPORTANT: Make a score line with tube cutters where the duotight fitting grips the thermowell. This prevents it from sliding under pressure.

6. Insert your temperature probe (RAPT, Inkbird, etc.) through the bulkhead and down into the thermowell. The probe will sit at the core of your liquid.

USING WITH TEMPERATURE CONTROLLER:

1. Connect your RAPT Pill or Inkbird probe to the thermowell's inner tube.
2. Set your target fermentation temperature in the controller.
3. Controller will read the core temperature continuously.
4. Heating/cooling coil (optional) will activate to maintain target temp.
5. Check the thermowell occasionally to ensure the probe hasn't shifted.

SHORTENING THE THERMOWELL:

1. Measure the interior height of your fermenter.
2. Mark the thermowell at desired length (leave ~1–2cm below liquid level).
3. Use tube cutters to cut. Cut straight, not at an angle.
4. Score a light line where the duotight will grip (prevents slipping).
5. Insert into fermenter.

AFTER FERMENTATION:
1. Disconnect the temperature probe from the thermowell.
2. Remove the thermowell by gently unscrewing the bulkhead nut.
3. Rinse with warm water immediately (don't let yeast dry on).
4. Soak in hot water for 10 minutes if residue is stuck.
5. Soak in One-Step or PBW cleaner for 30 minutes if needed.
6. Rinse thoroughly.
7. Air dry completely before storing.

CLEANING THE DUOTIGHT FITTING:
- Wipe the bulkhead fitting with a damp cloth.
- Rinse the o-ring separately.
- Don't soak the fitting in harsh chemicals (can degrade seals).
- Air dry before reassembly.

STORAGE:
- Store thermowell and fitting dry.
- Keep away from direct sunlight (stainless won't degrade, but o-rings can).
- Keep o-ring separate if storing long-term.
- Store in a cool place.

LIFESPAN:
- Stainless steel thermowell: Indefinite (won't wear out)
- Duotight fitting: Many years (o-rings eventually need replacement)
- O-ring replacement: Available separately if fitting becomes weak