Plumbing and repairing kitchen island sinks can be a deal more challenging than dealing with standard kitchen sinks. For routine kitchen area sinks, drain pipelines and vents are hidden and run straight through the kitchen wall – in general, they’re quite easy to install; for island sinks, however, installing a vent or drain pipeline takes an offer more work, Island vent pipes must necessary contain their own vent pipes, without running into the walls.

While setting up or plumbing an island sink takes a bit more work than plumbing a basic sink, it’s still something any able DIYer can do with the right devices and knowledge.

Step 1: What You’ll Need to Install/Replace an Island Sink

Similar to our other detailed plumbing guides, the initial step in venting or installing an island sink is ensuring you have all the required tools to get the job done. This includes things like:

Horizontal PVC pipes
Cleanout tee fittings
An air admittance valve or curved vent pipeline (either works for island sinks).

Prior to you set up an island sink, you’ll have to decide whether you wish to use a an island vent or air admission valve to vent the sink. The only big difference in between the two choices is that air valve systems do not require any outside venting, which is needed by standard island vents. The drawback to these valves is that they can be a discomfort to deal with and might not have the ability to keep up with high flows or volumes of water.

Step-by-Step Guide to Plumbing for Island Sinks

Step-by-Step Guide to Plumbing for Island Sinks

Step 2a: Installing a Curved Island Vent.

This step is for those installing a rounded pipe vent in their island sink. For steps on installing an air admittance valve, skip over to Step 2b.

To install a conventional island sink vent, initially attach a horizontal pipeline about 6″ approximately to the drain pipe, after the sink’s drain trap (the “P” formed curvature in the sink’s pipe). At the other end of the PVC pipeline, connect a cleanout tee fitting vertically. The cleanout tee will make it simple to unclog or snake your pipelines need to they become plugged. The downward opening will certainly be for your water circulation pipe, while the upward tee opening will certainly serve as the air vent opening.

Set up the water circulation pipe as your typically would, and run the pipe below the kitchen floor. Attach a vertical pipeline to the other end of the tee fitting as high as possible within your island cabinet, leaving enough space for a 180 degree curve. You can use either 2 90 degree pipe sections or one 180 degree curve; in any case, the key at this phase is to make sure the curve is as high as it can perhaps be within your island cabinet.

The function of the rounded vent pipeline is to constantly supply air to the P-trap (or other design drain trap), which enables water to drain at a constant speed. This venting technique eliminates the requirement for outdoors vents, such as those that standard, wall-mounted sinks have.

Step 2b: Venting Your Sink With an Air Admittance Valve.

This step information how to set up and utilize an air admittance valve in your island sink, in addition to best care practices.

Installing an air admission valve is a bit more easy than installing a vent pipe. Like a vent pipeline, you should install an air admission valve as physically high as possible within an island cabinet, utilizing a vertical cleanout tee fitting.

Attach a horizontal pipe to the sink’s drain pipe after the drain trap, and set up a cleanout tee at the other end. Run a downward plumbing as you would for a routine sink, and install an upwards pipe to the opposite end of the tee fitting. At the top of the vertical pipe, connect the admittance valve.

The valve, which runs through gravity, will open to let air in when water flowing through the drain pipeline produces unfavorable pressure. This capability removes the need for a vent pipeline completely (nevertheless, you’ll still need to run a conventional pipes under your kitchen floor). By following these steps, you should have a properly vented and function island drain pipe.


If you need a Fort Myers Plumber to assist you with your plumbing projects, please call us today at (239) 260-4446, and we’d be happy to provide you with a free quote.

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