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The BSC PREFERRED DIB855-9 is a 1-1/4 inch chrome-plated die-cast slip joint nut designed for drain line connections in residential and light commercial plumbing systems. It includes a poly washer to create a leak-resistant seal at slip joint fittings. The chrome finish provides corrosion resistance in wet environments. This nut is a standard repair and replacement component used by plumbers and pipefitters when servicing sink drain assemblies, P-traps, and related drainage piping.
This slip joint nut is suited for 1-1/4 inch drain line applications commonly found under kitchen and bathroom sinks. It is used when replacing worn or damaged nuts on P-traps, drain extensions, and tailpieces. The included poly washer eliminates the need to source a separate gasket, making it a convenient single-component replacement for standard slip joint connections.
Designed as an OEM-style replacement for 1-1/4 inch slip joint drain fittings in residential and light commercial plumbing drain assemblies.
Installation is performed by licensed plumbers or qualified trades. Shut off water supply and clear the drain line before servicing slip joint connections. Hand-tighten the nut first, then snug with pliers — avoid over-torquing die-cast fittings, as excess force can crack the material. Work must comply with applicable local plumbing codes and IPC standards.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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