Dual Port Lid For Big Mouth Bubbler (Universal)
This lid has dual ports and will fit any Big Mouth Bubbler. It features ribbed silicone rings which provide for a great seal. The dual-port design allows you to monitor temperature while still maintaining your air lock. The ports are compatible with a small universal stopper and a #6.5 Drilled Rubber Stopper Bung.

California Proposition 65

Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.