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These PVC profiles are used in conjunction with 4mm thick twinwall polycarbonate glazing sheets. One half of the S-shaped profile is an effective sheet end closure, reinforcing the top and bottom of the glazing sheets to provide extra rigidity. The other half of the S-profile can sometimes be fitted to the greenhouse framing to provide useful extra rigidity. Many greenhouses feature a compatible cill upstand. The S-profile is approximately 1'10" long (570mm).