Are you considering using the Shipco® bronze butterfly isolation valves? If not, you should be!
Shipco’s® bronze isolation valve is mounted between the pump & motor assembly and the receiver on floor mounted units.
Shipco® is the only manufacturer to offer as standard, an additional isolation valve placed in the pump bleed line. No other pump manufacturer provides this safety feature as a standard item.
For more info: https://www.mjdcombustion.com/shipco