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2 in x 3 in H - System 636 PVC Coupling. Part of the plastic pipe, fittings, and cement system certified to ULC S636 for venting high efficiency gas appliances. The first certified system launched in 2007 still remains the preferred system in Canada. Oran
2 in x 3 in H - System 636 PVC Coupling
Part of the plastic pipe, fittings, and cement system certified to ULC S636 for venting high efficiency gas appliances. The first certified system launched in 2007 still remains the preferred system in Canada. Orange warning labels clearly identify System 636 pipe and fitting components.