Thetford C402C & C403L Cassette Toilet Parts and Flush Controls

The Thetford C402C and C403L are different versions of the C400 cassette-toilet family. The flush hardware, electrical controls, reed switches and some body fittings differ. This guide identifies the original Thetford parts by their numbered factory callouts and shows matching UsedRVParts catalog products where an exact model application is supported.

C402C pump versus C403L water valve

C402C flush-water circuit

Toilet flush controlFactory reference 5181062, callout 7
12V flush pumpThetford 29027, callout 2
Toilet bowl rinseInspect hose, funnel and wiring

C403L pressurized-water circuit

Toilet flush controlFactory reference 5181262, callout 7
Electric water valveThetford 23709, callout 6
Toilet bowl rinseRV freshwater supply supplies pressure
Original simplified functional illustration, not a wiring or installation schematic. Follow the manufacturer drawing for exact callout positions and model-specific service procedures.
Important model difference: Do not order the C402C 12V flush pump to replace the C403L's electric water valve. Thetford also lists different control panels, overlays, reed switches and kicking plates for the two versions.

Original C402C/C403L 16-callout parts reference

The following numbers follow Thetford's revised November 2025 C402C/C403L parts sheet. Shared callout numbers can have different part numbers for each model; compare the model badge before ordering.

Callout Applies to Factory number Component
1 Both 5181462 Seat and cover (replaces 32309)
2 C402C 29027 12V flush pump (replaces 33368)
3 Both 5180362 Handle (replaces 51803)
4 Both 51802 Handle shaft
5 C403L 16833 Vacuum breaker
6 C403L 23709 Electric water valve, hose nut and barb
7 C402C / C403L 5181062 / 5181262 Different model-specific control panels
8 C402C / C403L 32321 / 32314 Different control-panel overlays
9 C403L 20106 Relay
10 Both 32319 Wire harness
11 Both 32311 Wall seal
12 Both 16451 3A fuse (replaces 33342)
13 C402C / C403L 3231662 / 3231762 Different model-specific reed switches
14 C402C 3231506 Water-fill funnel with cap
15 C403L 32324 Vent hose and seal
16 C402C / C403L 3243462 / 3243362 Different kicking plates with clips

Thetford identifies earlier numbers 33368, 32320 and 32313 as superseded by 29027, 5181062 and 5181262 respectively. Distributor numbers such as 49989, 50020 and 50040 are presented in the product listings below; a model-specific catalog listing does not establish interchangeability with every factory revision.

Matching C402C products in UsedRVParts

These exact catalog records are identified for the C402C model. Check each listing for current condition and availability. Viewing and pickup, where offered, is by appointment in Kelowna.

Thetford 49989 — 12V Flush Pump product photograph from UsedRVParts
Thetford 49989 — 12V Flush PumpCatalog-listed 12V pump for C402C; manufacturer callout 2 specifies service number 29027. SKU 07-9655.Check part and availability
Thetford 50020 — C402C Flush Panel product photograph from UsedRVParts
Thetford 50020 — C402C Flush PanelDistributor-labeled single-button C402C control panel. Compare your original connector with Thetford's current 5181062 diagram reference. SKU 07-9651.Check part and availability
Thetford 50040 — C402C Water-Fill Funnel product photograph from UsedRVParts
Thetford 50040 — C402C Water-Fill FunnelCatalog-listed funnel with cap for C402C. The current factory diagram lists 3231506 for the funnel assembly. SKU 07-9646.Check part and availability

C403L owners: The 50275 single-button control-panel listing is also available in this store, but its equivalence to the current factory 5181262 control panel has not been confirmed here. Match the original part marking and connection before choosing a replacement.

Original Thetford exploded diagram

View the C402C/C403L original manufacturer exploded diagram and parts list (PDF). Use this reference to confirm all 16 callout locations and the correct revision for your toilet.

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