STI™ Gasketed Sewer Fittings are now fortified against stress and breakage to a degree never before available in a PVC sewer fitting, says the company. Wall thickness of the 4-inch branch is now 192% thicker than SDR 35 and 115% thicker than SDR 26. Wall thickness of the 6-inch branch is now 94% thicker than SDR 35 and 46% thicker than SDR 26.
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