Fittings accept flexible hose but can be adapted to rigid PVC pipe. Features up to a 10-year warranty. Sizing: 2x20 equals 40,000 BTU, 4x20 equals 80,000. Requirements: 15ft rd 40,000, 24ft rd 80,000, 33ft rd 120,000, 12x24 oval 40,000, 16x32 oval 80,000, 18ftx34ft oval 120,000.

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