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Uponor’s ProPEX engineered polymer fittings, lead-free brass sweat and threaded adapters and larger-diameter AquaPEX tubing (all up to 2”) are listed to UL 1821 and ULC/ORD-C199P for use in AquaSAFE residential multipurpose fire sprinkler systems. The listing also allows designers to use 3/4” tubing and fittings for a majority of their systems.