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20'x100' Greenhouse Frame Quonset 195 The Trolmaster DSD 1 Dry contact module The Trolmaster DSD 1 Dry contact module provides a simple and flexible solution to who want to connect & control devices to the Hydro X using a “dry contact” or relay to activate the device 20'x80' Semi Gable greenhouse frames have taller sidewalls that reach a higher peak than the Quonset greenhouse frame type
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