Sink: Overflow Drain

: This channel connects back to the main drain pipe below the basin, allowing the water to escape safely.

| Type | Description | Pros | Cons | |------|-------------|------|------| | | Molded into ceramic or cast iron sinks | Seamless, durable, easy to clean | Cannot be added to existing sinks | | Surface-mounted | Metal ring with slots attached near rim | Can retrofit some sinks | Rare, less reliable, prone to leaks | | Channel overflow | Hidden internal tunnel from rim to drain | Clean look | Hard to clean if clogged | overflow drain sink

Many people install decorative caps over the overflow hole to match their faucet finish. It is critical that these caps are "vented." Installing a solid, non-vented cap seals the system, eliminating the air intake, which will cause the sink to drain incredibly slowly ("glugging"). : This channel connects back to the main

At its core, the overflow drain is a passive hydraulic bypass. At its core, the overflow drain is a

| Brand | Model Example | Material | Overflow Style | |-------|---------------|----------|----------------| | Kohler | Caxton | Cast iron | Integrated | | American Standard | Edgewater | Vitreous china | Integrated | | Kraus | Selina | Stone composite | Integrated | | Duravit | Vero | Ceramic | Hidden channel |