Product Specifications Audible pressure-relief alarm activates at 6 psi â€Â¢ Easy-on/easy-off lid provides positive seal, no gasket required â€Â¢ Jar permanently etched, large print minimum/maximum water level marking that are easy to read and will not rub or wash off â€Â¢ Soft plastic diffuser resists clogging due to mineral build up from water â€Â¢ Large, quad wing nut for a secure connection â€Â¢ Disposable, single-use and latex-free