From their website:
"MagDrive Series 6 Pump ( & Series 1 Pump)
Due to the elimination of the mechanical seals, PROCONs family of MagDrives provides you with a virtually leak proof pump. They are designed for those applications which use a hard to contain fluid (e.g. glycols, oils, low surface tension fluids, etc.). PROCON's Series 6 MagDrive is designed and built to meet your needs for higher flows. The flow rate capacity for this pump ranges from 300 to 660 gallons per hour at 250 psi. No integral relief valve is available.
Applications include: Carbonated water for soft drink dispensers, Espresso coffee machines, Beer cooling systems, cooling for TIG Welders, Reverse Osmosis systems, ultra-filtration systems, cooling circulation, constant temperature control, atomizing / misting systems, Automated pesticide misting systems, carwash machines, steam cleaning machines, cooling for X-Ray and medical lasers, water purification, boiler feeds, pressure booster pumps, and light hydraulic oils."
They recommend that you not dead head their pumps. They imply it'll burst pipes.