Viessmann 7133088 Oil Filter Insert 320720-756 What is the connection size

What is the connection size for this pressure relief valve

While the 221526 is factory-calibrated for Natural Gas

this zoning system controller manages heat pump

System Efficiency: Reduces heat loss through the venting system during the off-cycle

Viessmann 7133088 Oil Filter Insert 320720-756 What is the connection sizeThe Viessmann 7133088 Oil Filter Insert is a critical OEM replacement part engineered for high performance fuel filtration in residential and commercial heating systems. Designed specifically for Viessmann Chassis oil burners and Vitoflame 100 VEM 18 40 series, this cartridge ensures that the oil burner nozzle receives a steady supply of contaminant free fuel. By trapping microscopic sediment and sludge, the 7133088 oil filter prevents irregular flame