ED1/ED2 Header O-Ring

This 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.