Sight Glasses
Sight (site) glasses are viewing ports to see inside a furnace while it's running. They are made of special clear high-heat material.
SG-510 round burner sight glassPart # SG-510 $16.76 | SN-500 slip nut w/ gasketPart # SN-500 $4.00 | 025-30899-000 Coleman sight glassPart # L39-455 $0.74 |
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