Plumbing help - new lav. and drain

[Julie]

Howdy,

I've installed a new sink, faucet and drain in a bathroom.

I followed instructions and all went according to plan, but the drain leaks from the uppermost gasket right underneath the sink. Is it more likely that a) I just need more putty than I could possibly imagine around the flange, b) I need a different drain (bigger flange?), or c) I've messed something else up?

Thanks, JSH

[Bill Schnakenberg]

a) Plus tighter screw down of the big nut, or c)

[Speedy Jim]

You need to put sealant (silicone caulk) on the top and bottom surfaces of the Mack rubber washer. Also apply sealant to the threads which the washer covers. That should fix it. Dry all the parts with a hair dryer beforehand.

Jim