water here now is 46F. I have a water heater and I stay relatively warm underwater. But the weather is turning a little nasty, so I might call it a season. I have to revamp some things in the dredge and I'll study the air supply system more carefully. I have a reserve tank and I found some water there too (after the air filter). I'll also check other mask; when I come out of the water and take the mask off, my vision still is in a fog for another 5 minutes or so ...I don't think I'm doing my eyes too much of a favor ! This mask doesn't come with a mouthpiece. Regulator and mask are one well integrated unit; it don't look to me like swaping regulators would be easy. Keene actually sells another ffm where you can attach your own regulator. You just remove the mouthpiece of the regulator, stick regulator in the mask and tie-wrap it.......it was cheaper.... didn't look too solid to me......