March builds high quality pumps that will provide years of dependable service. Unlike cheaper pumps that can be frustrating to operate (due to such reasons as poor motor and body alignment leading to binding, poorly cast and low quality parts being easily broken, under powered motors leading to stoppage when grain enters the pump head and motors that readily burn out) these pumps are brewery workhorses that will provide years of dependable service.
The March beer pumps are non-self-priming magnetic drive units built specifically to handle hot wort and water. The benefits of a magnetic drive, centrifugal pump are that they don't have a mechanical seal (which is leak prone and can be expensive to repair) and are not positive displacement (which can over-pressurize leading to damage or rupture). However, they require liquid being pumped to lubricate the internal parts. If the pump is run dry for a period of time the impeller and shaft may become damaged. To regulate the flow use a valve on the discharge/outlet.
The 815-SS-C homebrewery pump has a maximum flow rate of 8gpm/30lpm or head of 13.5ft/4.1m (approx 4gal/min at 5psi) and is a great size for Small, Medium and Large (90L/24gal) brewing systems. Pump comes with one 1/2" MPT and one 3/4" MPT post.
Additional accessories can be added such as hoses (5' of 0.5"ID and 2' of 0.75"ID food-grade, high-temp, heavy-duty, high-pressure, braided silicone tube, two 1.5" TC (tri-clamp) clamps, two 1.5" TC silicone gaskets, one 3/4" FPT x 1.5"TC fitting and one 1/2 FPT x 1.5" TC fitting) or hoses and pump cart. (Note: Cart in picture is shown with a March 5S pump, the 815 is a little smaller.)
For details on Proposition 65 (California residents) see March's website.BREWinfo: Installing the pump hoses and fittings
BREWinfo: March pumps spec sheet
Troubleshooting the March 815 beer pump
Troubleshooting the March TE-5S-MD beer pump
March Pump Troubleshooting Guide