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The FLUIDMASTER INC 4T12UCSRP4 is a 12-inch universal toilet supply connector featuring a Click Seal design for a reliable, leak-resistant connection. It ships in a pack of four, making it a practical choice for multi-fixture jobs or stocking a service van. The connector uses 3/8-inch compression inlet and 7/8-inch ballcock outlet end fittings, standard sizing found on most residential toilets. Licensed plumbers and experienced DIYers install this type of supply line during toilet replacements, flapper repairs, or rough-in work where the existing connector is corroded or damaged.
This connector suits residential bathroom applications where a standard 12-inch supply line run bridges the shutoff valve and the toilet tank inlet. The 3/8-inch compression by 7/8-inch ballcock configuration aligns with the most common residential toilet rough-in layout. The four-pack quantity supports contractors servicing multiple units in apartment buildings, hotels, or new construction where consistent, uniform hardware is preferred throughout the job.
Designed as an OEM-style replacement supply connector for residential toilets with a standard 3/8-inch compression angle stop and a 7/8-inch ballcock tank inlet.
Installation is performed by a licensed plumber or qualified tradesperson following applicable IPC and local plumbing code requirements. Shut off the water supply at the angle stop valve and flush the toilet to relieve pressure before removing the old connector. Hand-tighten the compression fitting first, then use an adjustable wrench for a final snug quarter-turn — do not overtighten, as this can crack the ballcock shank or strip the compression nut. After installation, slowly restore water supply and inspect both end connections for drips before considering the job complete.
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