I'm installing a Push Button (not pop-up) drain in my pedestal sink. A rubber washer goes between the metal drain and the sink (another rubber washer goes under the sink). Is it still appropriate to use plumbers putty in this situation?
Increasingly, I'm finding that plumber's putty is not recommended for sink drains, especially if it has its own rubber gasket. In places where the manufacturer does not supply a gasket (and the flange is not metal) they suggest silicone caulk.
Be sure to read the directions for your drain assembly!
Not unless it leaks.
I've installed a couple of sink wastes with supplied foam washers that compress down to almost nothing. They were very effective (I first thoroughly cleaned the old putty completely away from the porcelain).
I would not use putty. Be sure the bottom of the sink is clean and smooth.The rubber gasket should be sufficient to seal without putty.
Of the few drains I’ve installed, I always discarded the top rubber foam-like seal. The main reason for this is that the drain will sit slightly lower, hardly leaving a gap between top of the drain and sink. This allows the water to drain completely, instead of a small amount of water remaining around the drain seal. This way, in time, there will be no dry water stain around the drain seal.
I would use a the rubber seal on top and the bottom if i had an extra . Put a little cooking oil on the rubber both sides to keep it bind free ( like an oil filter) and torque down till the rubber starts to oval on the outside edge . (plumbers putty solidifies over time under high hot water heater settings and cracks at cold water expansion and contraction and allows the leaks .
Yea, don't skip the putty, or something, on the sink parts I'm working on without the putty there is no seal. THREADS ON FITTINGS DO NOT MAKE A WATERTIGHT SEAL. Never have, never will, by virtue of you being able to screw things together, they're not sealed tight.