EasyPro Skid Mount Cartridge System Model:SMC120M They are a TRUE 3/4"

They are a TRUE 3/4" (12/16" on a ruler)

and six months after opening

organic-reducing results in ponds

no vibrations and no lubrication to be done

So for example

EasyPro Skid Mount Cartridge System Model:SMC120M They are a TRUE 3/4"EasyPro Skid Mounted Cartridge Systems comes fully plumbed and ready to work! Simply connect your incoming and outgoing water lines and installation is complete, making skid mount systems a great ready to go option for formal fountains. All kits come with 115v pump, cartridge filter, base, and all plumbing (including a water bypass line around filter). Medium kits include chlorinator and Schedule 80 fittings and pipes. SKU Base Filter Size Pump Max