Press down on the putty, so it adheres to the sump basin. If your subwoofer driver came with a rubber or foam gasket, feel free to try that out. I'm fond of duct putty because you do not have to tighten the driver too much in order to get a good seal. This clip shows how to...
3178206 Polytetrafluoroethylene tubular tailpiece connecting a basin to glass pipe 1965-04-13 Martin et al. 3144832 Portable self-priming floor drainer pump assembly 1964-08-18 Haynes D15/7 3098663 Roof collar construction 1963-07-23 Dibley 3010598 Cooperating container 1961-11-28 Foss 2911001 ...