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QT-DS-FF-02-03 Brass Reducing Coupler - 1/4 in Female to 3/8 in Female
Choose the specified configuration and pack quantity. The complete sales unit and matching connection sizes are listed below.
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Ships from China · 5–7 calendar days preparation. Shipping · Returns

QT-DS-FF-02-03 Brass Reducing Coupler - 1/4 in Female to 3/8 in Female
Join two compatible male-threaded ports of different nominal sizes.
Each base unit includes one complete fitting.
Model & Reference Codes
| End A | 1/4 in female thread |
|---|---|
| End B | 3/8 in female thread |
| Approx. axial length | 19.4 mm |
| Shipping SKU | QT-DS-FF-02-03 |
| Sales unit | 1 complete fitting |
| Pack options | 1 / 5 / 20 identical fittings |
Original model-specific supplier image with reference annotations.


Install and check
Isolate and fully depressurize before installation or removal. Match both mating threads and seats. Use suitable sealing for each connection. Tighten at the fitting wrench surfaces. Restore air gradually and check for leaks.
Build your order, pack by pack.
Ships from China · 5–7 calendar days preparation.
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QT Brass Threaded Adapters
Compare the available configurations in this family. Match the mechanism, connection sizes and complete sales unit before ordering.
Reducing Bushings (11)











Female Couplers (12)












Male-Female Adapters (11)










