A sink drain leak is due to one of two kinds of conditions, but either one can be due to the drain being clogged and not cleaned properly. Nevertheless, they can also be due to an improperly-sloping drain pipe, so this requires to be checked carefully. It’s critical, of course, that you locate the exact source of the leak, as repair completely depends on where it’s leaking. It can be leaking where the drain itself is located in the sink basin, or it can be leaking where the entire drain is fastened into the house plumbing, or it can be leaking from points in between.

You might notice that there are several types of drains. A lavatory or a tub may have a simple p-type or s-type drain. P-type drains are preferred, where the outflow tube is horizontal where it goes into the subsequent drain because this should mean that the unit is properly vented. S-type drains, where the drain from the trap is perpendicular, are usually found in older installations, where the venting is more remote. Kitchen sinks may have either, but they also typically are a double drain, with the drain from one sink flowing into the underdrain of the other.

The first type of cause is corrosion or other damage to the drain itself, in which case you have no choice but to replace the drain, which is not difficult. For any hidden drain (as in the cabinet under the sink), Many would mostly suggest PVC as being the most long-lasting and practical. Metal drains can corrode away very quickly. Get the most reliable and the best quality Hydraulic hose fittings  for your kitchen.

The second type of problem is a poor gasket or sealing ring. Typically, the drain is installed in the bottom of the basin itself with both a gasket rink and a plumber’s putty. All other joints in the drain typically have a ring seal made of plastic. All of these are replaceable. If you replace one, you might want to change others as well. The joints are either compression ring joints, where cranking down on the sealing nut pressurizes the sealing ring against the male end of the inserted piece, or they are clamping joints, were cranking down on the sealing nut simply compresses a gasket ring. However, it’s easy to see what’s what if you undo the sealing nut and separate the pieces.

It’s okay to pull the whole drain out and to take it apart. They’re actually made for that. If you do, be sure to thoroughly clean all parts before putting them back together, with new sealing parts as needed. It is recommended to use a plumber’s putty when re-seating the drain in the fixture itself.