BFP21R5 Danfoss oil pump can replace AS47B1537 for BTL20 Oil burner|oil pump |oil pump replacementcan pump - AliExpress
Buy Oil Pressure Switch(Range: -1 to 0 Bar) for Automobiles, Pumps, Boilers, Steam Turbine, HVAC by Danfoss Model: RT-121(Pack of 2) Online in Hong Kong. B07LD58K4B