Thetford Aqua-Magic IV RV Toilet Parts & Diagrams

The Thetford Aqua-Magic IV is an older permanent RV toilet offered with a hand-operated flush lever or a foot pedal, in high- and low-profile versions. Several of its sealing and flushing components are still available separately. Use your toilet's identification label and the two factory drawings below to find the correct part.

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Factory parts diagrams: hand flush and pedal flush

These are two different exploded drawings. The blade seal, flush tube and blade spring appear in both, but their numbered positions change. The hand-flush version uses a lever; the pedal-flush version has separate pedal and cable components.

Identify the part by diagram number

Use the column for your flush style. The numbers refer to positions in the original Thetford illustrations, not to a generic toilet diagram.

The floor-flange seal is 33239 and is not pictured in either exploded drawing. For toilet mounting hardware, see the 49987 bolt-and-nut listing. The original 12524 closet bolt kit and the separately specified 33239 floor seal should be identified by their included components when reinstalling the toilet.

If the bowl will not hold water

Inspect the waste blade for debris and check the seating surface of the 33027 blade seal (catalog item 50371). It seals the flush opening below the bowl. The blade spring, 33317 (catalog item 50562), is a different part that helps return the blade mechanism. A floor-flange seal will not repair water escaping through the bowl's waste opening.

If flush water is not reaching the bowl

The 33312 flush tube (catalog item 50373) carries water within the toilet's flush system. Check its connections, visible damage and the operation of the water valve before choosing a replacement. The factory diagrams identify the water valve as 13168 and the water-valve link as 33315; they are separate from the flush tube.

High and low profiles, and hand versus pedal controls

The actuator assemblies differ between high and low toilets: Thetford lists 34633 for high and 34632 for low. Match the installed toilet and its original mechanism before replacing an actuator or lever. The foot-pedal system also uses its own cable and pedal, so parts for the hand lever should not be selected on appearance alone.

Care and related toilet diagrams

Shut off the RV water supply and release pressure before disconnecting the flush tube or water valve. Thetford recommends non-abrasive cleaning products and silicone-based lubrication for a stiff waste blade. Follow the Aqua-Magic IV owner's and installation manual when servicing the mechanism or reinstalling the toilet.

For a different toilet, see our Aqua-Magic V parts diagram or Aqua-Magic VI parts guide. These models have different internal parts despite their similar names.

Aqua-Magic IV replacement parts with photos

Blade sealThetford 33027

Single rubber seal around the waste-blade opening. This is not the floor-flange seal.

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Flush tubeThetford 33312

Replacement plastic flush-water tube for Aqua-Magic IV high- and low-profile toilets.

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Flush-blade return springThetford 33317

Single spring for the waste-blade mechanism, listed for the Aqua-Magic IV.

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Toilet mounting bolts and nutsThetford 12524

Mounting hardware for Aqua-Magic IV and V toilet bases. Check for a separate floor seal when reinstalling.

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