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The Draper part no 33412 is a spring primarily used in Draper Diesel Space Heaters, compatible models including:
Draper DSH1750 32284 175,000BTU (51kW) diesel space heater
Draper DSH750 32286 75,000BTU (22kW) diesel space heater
Draper DSH450 32287 45,000BTU (13kW) diesel space heater
Draper DSH2150 53925 215,000BTU (62kW) Diesel Space Heater
Draper DSH1250 32285 125,000BTU (36kW) diesel space heater