The MK11's balanced diaphragm design is compact and lightweight, making it the perfect travel companion. The diaphragm system keeps water and pollution out of the main mechanism, increasing reliability and performance. Its polished chrome forged brass body features identical high pressure and low pressure ports on each side so you can hook it up to your tank in either the up or down position while maintaining the same port layout. Also, two of the low pressure ports are high-flow, delivering about 15 percent more air than the standard low pressure ports. This means lots of effortless airflow with every breath.