The Schedule 40 PVC Threaded Bushing (MPT x FPT) is the standard solution for reducing the threaded outlet size of a fitting without using glue. Designed with Male Pipe Threads (MPT) on the outside and smaller Female Pipe Threads (FPT) on the inside, this bushing screws directly into a larger female fitting (like a Tee or Valve) to accept a smaller threaded component. To ensure a leak-free seal on both connection points, the use of Thread Seal Tape is required.
These reliable irrigation fittings are essential for adapting valve manifolds, reducing pump outlets, or stepping down threaded risers. Because they are flush-fitting, they reduce the pipe size efficiently without adding unnecessary bulk or length to the system.
Specifics for threading compatibility.
| Specification | Details |
|---|---|
| Product Type | Threaded Reducer Bushing |
| Connection 1 (Outer) | Male Pipe Thread (MPT) |
| Connection 2 (Inner) | Female Pipe Thread (FPT) |
| Material | Schedule 40 PVC (White) |
| Standards | ASTM D-1784, ASTM D-2466, NSF Approved |
| MPNs |
439-005 (1/2" x 3/8" or 1/4"), 439-101 (3/4" x 1/2"), 439-130 (1" x 1/2"), 439-131 (1" x 3/4"), 439-210 (1 1/2" x 3/4"), 439-211 (1 1/2" x 1") |
| Common Brand Names | Lasco, Spears, Dura |
Proper taping is crucial for threaded bushings.
Step 1: Tape the Bushing
Apply Thread Seal Tape clockwise to the outer male threads of the bushing (3-5 wraps).
Step 2: Install Bushing
Screw the bushing into your larger female fitting (e.g., Tee or Valve). Hand tighten, then use a wrench for a final half-turn. Do not overtighten.
Step 3: Tape the Inner Component
Apply tape to the male threads of the smaller pipe, nipple, or riser you intend to install.
Step 4: Final Connection
Screw the smaller component into the inner threads of the bushing. Hand tighten plus a quarter turn.
Verify your thread types:
Ensure a leak-free assembly with these parts:
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