Nature's Head Replacement Parts Guide: What Wears, What Fits

A Nature's Head has few moving parts, and Nature's Head says its metal hardware (bolts, hinges, latches, knobs, agitator and trap door parts) is stainless steel or brass. Most problems trace back to a small list of parts: the fan and filters, the agitator bar's bushings, the seals, the slip hinge and the trap door, plus the 12V bits that power the fan. This guide groups the parts by symptom, gives the Nature's Head part number for each one we list, and notes which ones fit the Weekender.

Quick map: symptom to part

Fan, filters and power

The fan is the part that keeps the toilet odor-free, so it's worth knowing which one you have. Nature's Head now sells two assemblies:

• High-Flow Replacement Fan Assembly (NH-HIGHCFM-FAN). A 40 mm x 15 mm fan against the original's 10 mm, with more airflow and, Nature's Head says, no added noise. It has an IP67 coating and orange WAGO connectors so the fan alone can be swapped later. It comes with a new housing, a 5.5 x 2.5 mm jack and one High-Flow filter. It has been standard on new toilets since August 2026, per Nature's Head, and works as an upgrade for existing toilets.
• Original Replacement Fan Assembly (NH-Fan-Assembly). The original 10 mm fan.

How to tell which you have: per Nature's Head, a High-Flow toilet has orange WAGO connectors inside the housing and its power jack on the back of the toilet. On older units with the original fan, the jack sits next to the vent hose connection. Nature's Head warns that putting an Original fan on a toilet that came with a High-Flow fan reduces airflow.

Fitting a fan: Nature's Head's fan sheet covers this.

1. Remove the two housing screws, then the two fan screws. There's a filter between the fan and the toilet.
2. Fit the new fan with the sticker facing out, so it blows out, and its screws lined up with the holes in the toilet, not the brass inserts.
3. Tighten gently. Over-tightening can distort the fan so the blades bind or it burns out.
4. Wrap the wires carefully, then screw the housing back into the brass inserts.

Filters: there's one on each side of the base. Nature's Head says to remove and clean them yearly; each is held by two Phillips screws. We list the replacement fan filter, which fits the Nature's Head and Weekender, and the High-Flow filter kit.

12V parts (our listings name both the Nature's Head and the Weekender for the cable, fuse, fuse housing and AC adapter):

• 12V fan cable, 6 ft (NH-Cable)
• spare fuse (NH-Fuse)
• fuse housing (NH-FusHous)
• 110V AC adapter (NH-Adapter)
• 12V plug with switch (12V-CIG-PLUG)
• socket panel (12V-CIG-SOCKET)
• power kit (12V-CIG-POWER-KIT)
• wall power port kit (12V-PORT-KIT)

The 12V plug and the power kit connect to the toilet with a 5.5 x 2.5 mm barrel connector, and the wall port kit uses a 6 ft cable with barrel connectors on both ends. Wiring is covered in our installation guide and our fan power answer.

Agitator, handle and bin

The agitator bar is meant to fit tightly. Nature's Head's flip-or-replace sheet says to pull hard, because that won't break the bar or the base. Here's how it goes:

• The long end has a notch and takes the handle. The short end has no notch.
• Each end gets a washer, then a bushing with its wider side against the washer.
• The bushings aren't seals. Nature's Head says the compost shouldn't be wet enough to leak.
• To fit the handle, turn the bar so the flat notch faces up and center the set screw on it. Tighten the set screw as hard as you can with the Allen wrench, then tighten the nut against the hub so it can't back out.

Agitator parts we list:

• Agitator Bar Repair Kit (NH-AGREP-KIT): 2 bushings, 2 washers, 2 cotter pins
• Replacement Agitator Bar (NH-Ag-Bar), with washers and bushings
• Agitator Bar for Weekender (NH-Ag-Bar-Wkndr), which is specific to the Weekender
• Spider handle (Spdr-Handle), which fits the Nature's Head and Weekender
• Foot Spider handle (FT-Spd-Handle)

For a second bin, the Extra Base with Lid, Spider handle (NH-Base-Spd) and Foot Spider version (NH-Base-FS) come with the agitator installed. Nature's Head's manual says the extra base also includes the bottle holder and a vented lid, so a full base can sit and keep composting. The Lid for Solids Bin (NH-Lid) is the vented lid for carrying a bin.

Bottle, seals, hinge and trap door

• Extra Liquids Bottle, 2.2 gallon (NHBtl), the standard-size bottle with cap. The Weekender's bottle is 1.75 gallons per its manual, so we don't list the 2.2-gallon one as a Weekender fit.
• Spare bottle cap (NH-Cap)
• Bottle handle (NH-Btl-Handle)
• Liquids bottle seal (NH-Bottle-Seal). On the urine diverter kits, Nature's Head's instructions say newer toilets need two seals on the urine spout and older ones may not. Check for resistance when you twist the latched bottle, and look for a gap where the seal meets it.
• Base-to-bowl seal (NH-Seal)
• Slip hinge kit (NH-SHINGE): male and female hinge sections with bolts and nuts. The hinge joins the bowl to the solids bin.
• Trap door (TD-ASSEMBLY): door, bracket, bolts and nuts. It fits your existing arm, which isn't included.

Vent and mounting parts

• Inside vent flange (NH-Flange)
• Vent hose end (NH-VHE)
• 1-1/2" vent hose by the foot (NH-Hose), which fits the Nature's Head and Weekender
• Shell Vent Assembly (NH-ShellVent), or the Shell Vent with Installation Kit (ShellVent-Kit) with 12" of 1-1/4" PVC and a trim ring
• Portos-1 mushroom ventilator (Mushroom-Vent) for boats
• Mounting Hardware Kit (NH-MountingKit): two brackets, two knobs, two stainless washers and four stainless screws

Diverter owners can also get 1/2" urine diverter hose by the foot (UD-HOSE) and the 90 Degree (90-PTRAP) and In Line (INLINE-PTRAP) P-traps for the through-the-floor setup.

A spares kit worth carrying

For full-timers and boats, the Bag of Replacement Parts (NH-Parts-Bag) fits the Nature's Head and Weekender. Our listing shows it contains:

• 2 floor brackets
• 2 washers
• 4 screws
• a flange
• a bottle cap
• a 12V cable
• a fuse holder and fuse

Add a bottle seal, a fan filter and a bag of coco coir, and most small failures can be fixed on the spot. For the routine that keeps parts lasting, see our emptying and cleaning guide. Nature's Head warns that bleach, abrasives and magic erasers can damage the toilet.

FAQ

Will the High-Flow fan fit my older Nature's Head?

Nature's Head says the High-Flow assembly is an upgrade for all its existing toilets and comes with its own housing and jack.

Do Weekender and standard parts interchange?

Many small parts do. Our listings name both models for the filter, vent hose, 12V cable, AC adapter, fuse, Spider handle, parts bag and coco coir. The agitator bar is model-specific, the Weekender bottle is smaller, and the multi-directional diverter kit doesn't fit the Weekender.

How often should I replace the filters?

Nature's Head's manual says to remove and clean the filters on each side of the base yearly. It doesn't give a replacement interval; replacements are sold separately.

My fan stopped. What do I check?

Nature's Head's troubleshooting order:

1. On a battery, check the voltage, that positive goes to positive, the fuse, and the single-pin connection.
2. On the AC adapter, check the outlet and the plug.
3. Confirm the fan blows outward.
4. If it still won't run, replace the fan.

Every part above is in our Nature's Head collection. Found it cheaper? We'll beat it.