ED1/ED2 Header O-Ring filter-width_8 5/8 inches This is a PVC Schedule

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ED1/ED2 Header O-Ring filter-width_8 5/8 inches This is a PVC ScheduleThis is a Hayward Header O Ring for H Series Induced Draft, Low NOx Induced Draft, Electronic ED2 Style, Millivolt Electronic ED1 Style Pool Heaters. This Header O Ring goes on the following models: H150, H200 H210 H250, H300 H350, H400 Millivolt Electronic Ignition Pool and Spa Hot Tub Heaters and H250IDL2, H350IDL2, H400IDL2 Pool and Spa Hot Tub Heaters.