The Worcester Bosch spark return lead part is located near the electrodes. Usually, there are two different types of electrodes are ignition electrodes and flame-sensing electrodes. The ignition electrode creates the spark that starts the flame within the burner.

Brand Name	Worcester Bosch
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Manufacturer Model No	87161045530
Wear Type	string
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Certifications Met	string
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Protects From	string
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Compatible With	Worcester HIFLO 400 ELECTRONIC BSN NG, Worcester HIFLO 400 ELECTRONIC FSN NG, Worcester HIFLO 400 ELECTRONIC FSP NG and Worcester HIFLO 400 ELECTRONIC OSN NG
Waist Size	ac32ce94gw