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The VALUE COLLECTION 6RSB3/8X1/8 is a stainless steel reducer coupling designed for connecting two NPT-threaded pipes of different diameters in a single inline fitting. It transitions between two pipe sizes without requiring additional adapters, keeping the assembly compact and leak-resistant. Constructed from stainless steel, this coupling resists corrosion in demanding environments including wet, chemical, and high-humidity installations. Plumbers and pipefitters install this type of fitting in potable water, process piping, and mechanical systems where NPT-threaded connections are standard.
This reducer coupling is suited for residential and light commercial plumbing, HVAC hydronic lines, and industrial process piping where a reduction between two NPT pipe sizes is required. Its compact profile — approximately 1.12 inches in height and 1 inch in width — fits into tight spaces common in mechanical rooms and under-slab rough-in work. The stainless steel construction makes it appropriate for applications where brass or carbon steel fittings are not acceptable due to corrosion or contamination concerns.
Designed as an OEM-style replacement or new-installation reducer coupling for NPT-threaded pipe systems in plumbing, HVAC hydronic, and industrial process piping applications.
Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or local plumbing code requirements. Shut off and depressurize the line before removing or installing any threaded fitting. Apply an appropriate thread sealant or PTFE tape to the male NPT threads before assembly, and tighten to hand-tight plus the number of turns recommended by the sealant manufacturer. Do not over-torque stainless steel fittings, as galling on the threads can occur and compromise the seal.
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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