How to install a drain in the sink 2026

How to install a drain in the sink, placing a siphon pipe in a sink to prevent bad odors is a task that is carried out in very few steps and in a very short time. At Leroy Merlin you have a wide variety of models, in different materials, also flexible or for vertical exit.

Tools

• Screwdriver
• Hacksaw blade

Materials

• Siphon
• Sink valve
• Extendable PVC sleeve
• PVC cleaner
• PVC adhesive

Procedure:

Before buying you should see if the diameter of the general drain pipe is the standard 40 mm or smaller. You must buy the sink trap for that outlet or purchase a diameter reducer. Some manufacturers include gaskets of different thicknesses in the drain kit so that you can make the connection without having to install reducing sleeves. If you change the valve, it must have an outlet identical to the siphon tubes. If the outlet of the general PVC drain is flush with the wall, you will have to place a sleeve of the same thickness with PVC adhesive. Cut it to the size required by the elbow of the siphon outlet.

#1. Put the valve and the drain trap in the sink

Install the sink valve, taking into account that it is appropriate, especially if the toilet has a built-in overflow. Fit the bottom joint so that it does not move when tightened. Insert the retaining screw and valve screen until it fits into the valve thread. Screw the grill tightly, holding it while you tighten the valve at the bottom, as far as possible, so that it does not move.

Click-clack valves

This type of valve is one of the best sellers. Among their advantages is that they are very aesthetic and that they are very easy to install. With just one press you can open and close the valve and thus retain or release water from the sink. At Leroy Merlin you will find the most appropriate one.

#2. Place the seal of the straight extension sleeve inserted into the valve pipe. In any case, place the gasket according to the model of your siphon.

#3. Present the sleeve and twist it tightly with your hand.

#4. Next assemble the curved piece of the siphon. First insert the tightening piece, then the sealing gasket with the thin part inserted into the siphon tube and then tighten firmly.

#5. Keep threading pieces. Next is the elbow fitting that joins the bend of the trap and the PVC pipe of the drain. In this case, it is likely that the tightening thread that prevents it from coming out of the tube is already installed. Place the gasket and tighten as you did previously.

#6. Face the siphon outlet to the general drain inlet, to see if it matches. Insert the tightening thread and the sealing gasket into the PVC pipe. Bring the elbow fitting of the siphon closer and tighten firmly.

#7. Go over all the connections made, checking to see if they are tight.

#8. Open the tap and check that there is no leak by running a finger over the joints or a piece of toilet paper. You will notice the drip or leak immediately. To check it properly, fill the sink with the lid on and release it, so that there is a good flow.

Step by step video:

Source: leroymerlin

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