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R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Perma "R" Products R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

4.5
279
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209 Questions
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How can this have the same part number (15357) as the PolyPro EPS foam? They are both EPS but they are different products with different specs.