Toilet repair.
Every part explained.

The porcelain toilet and bidet-seat exteriors use Kohler’s K-31648 and K-8298 CAD geometry in inches. The toilet has a 12-inch rough-in and a 16½-inch bowl rim. We built the working tank parts, supply connection and floor assembly for this teaching model. The bowl view traces the water route; colored water makes its movement visible. The flush cycle is shortened for the demonstration.

Toilet drawing ↗ · Bidet-seat drawing ↗ · Bidet operation ↗

The whole toilet

The shutoff and supply hose bring in clean water. The tank releases and replaces its stored water. The bowl’s built-in trapway leads to the sealed floor connection.

Fill valve & cup float

The fill valve admits water after a flush. Its float rises with the water and shuts the inlet at the set level. The narrow refill tube also sends water to replenish the bowl.

Canister flush valve

The handle and chain lift this cylinder. Water enters the open outlet around its bottom edge and flows into the bowl. It drops back onto its seal as the tank empties.

Flush-valve seal

This replaceable ring seals the canister against the flush-valve base. It holds the tank’s water between flushes.

Overflow & bowl-refill tube

The center overflow gives excess tank water a route into the bowl. The small refill tube delivers the water that rebuilds the bowl’s standing water seal after a flush.

Trip lever & chain

The outside handle turns an arm inside the tank. A short chain transfers that movement to the canister.

Tank gasket & tank bolts

On this two-piece toilet, the large gasket seals the tank outlet to the bowl. Separate bolt gaskets seal the tank mounting holes.

Bowl & standing water

The glazed bowl receives the waste. Water stays in its bottom and the curved trapway between flushes, forming a barrier to sewer gas.

Built-in trapway

The curved passage is molded into the porcelain. A flush fills it and starts a siphon that carries the bowl contents to the floor outlet. Air then breaks the siphon, and refill restores the water seal.

Bowl wash passages

Water from the tank feeds the bowl’s wash passage and lower jet. Together they rinse the bowl and get the water moving into the trapway.

Closet flange

The flange joins the toilet to the drain and holds the closet bolts. Its base mounts on the finished floor in this new-installation example and fastens into the structure below.

Wax seal

Wax compresses around the toilet’s outlet when the bowl is lowered onto the flange. It seals wastewater and sewer gas at that joint.

Closet bolts & supports

Bolts lock into the flange slots and hold the bowl down. The base bears on the floor; shims support uneven contact points.

Floor connection & drain

The toilet outlet drops through the flange into the drain below. The built-in porcelain trap supplies the fixture’s water seal.

Toilet shutoff & supply hose

The local valve isolates the toilet. A flexible connector carries cold drinking water up to the fill-valve inlet beneath the tank.

Bidet seat

This elongated PureWash seat mounts to the toilet’s seat holes. It receives clean supply water and electrical power for washing and other features.

Retracting wash wand

The wand extends from the seat housing and directs a wash stream upward. Stopping the wash ends the stream and retracts the wand.

Bidet supply tee

A gasketed tee at the tank inlet divides the clean-water supply between the toilet fill valve and bidet seat. The seat hose runs from its side outlet.

GFCI-protected power

The electric seat plugs into a grounded outlet with ground-fault protection. The GFCI interrupts power if it detects an electrical imbalance.