Nozzle diameter is 0.67" (1.7 cm/17mm). It fits into our flip-top vent caps as well as all standard push-in, bayonet and DIN openings. Reliable automatic shutoff fills to the correct level. Shutoff is powered by the water. No solenoids, electronics or wiring is necessary. The unique design eliminates post shut-off drip. Rugged industrial design is made of ABS plastic and has a comfortable, easy to squeeze handle. Lock-in-place level control keeps fill depth from changing. Fills batteries quickly at approximately 1.7 GPM (6.4 l/m). Flow diffuser slows the rapid water flow to a gentle spray. Minimum incoming water pressure is 15 PSI.