Speakman GravityFlo Heated Portable Eyewash With the Speakman GravityFlo SE-4330 Heated Portable Eyewash, our goal was to create a product that would deliver suitable relief in the harshest environments. Featuring a water-resistant, insulated jacket that perfectly covers our signature GravityFlo SE-4300 Eyewash, this product keeps water tepid in weather conditions as low as -10° F. Its portable design allows you to place the unit practically anywhere on your work site. With a 20-gallon capacity tank, GravityFlo delivers water for 15-continuous minutes without being connected to a plumbing supply.