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The GREEN LEAF RB 12-38 P is a polypropylene plastic reducer bushing designed to connect a 1/2-inch male iron pipe thread (MIPT) inlet to a 3/8-inch female iron pipe thread (FIPT) outlet. This fitting reduces pipe size within a threaded piping system and is built from black polypropylene, a corrosion-resistant thermoplastic suited for low-pressure water and fluid distribution applications. It carries NSF 61 and NSF 372 certifications, confirming compliance with potable water safety and low-lead content standards. Licensed plumbers and pipe fitters install this type of reducer bushing in residential and light commercial systems where a threaded size transition is required.
The RB 12-38 P is used in residential plumbing, irrigation, pool and spa systems, and other fluid-handling applications that require a threaded reduction from 1/2-inch to 3/8-inch NPT. The MIPT x FIPT end configuration allows the bushing to thread directly into a female-threaded fitting or valve body, making it a practical inline reducer for a wide range of service scenarios involving water, certain chemicals, and non-aggressive fluids compatible with polypropylene.
Designed as an OEM-style threaded reducer bushing for use in any standard NPT-threaded 1/2-inch to 3/8-inch piping application where polypropylene material is acceptable.
Installation is performed by a licensed plumber or qualified pipe fitter. Shut off the water supply and depressurize the line before threading the bushing into place. Apply an appropriate thread sealant tape or compound to the male threads before assembly to ensure a leak-free connection. Do not overtighten polypropylene fittings with pipe wrenches, as excessive torque can crack the fitting body.
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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