1/4 in. x 1/8 in. Compression x Male NPT Polypropylene Adapter
1/4 in. x 1/8 in. Compression x Male NPT Polypropylene Adapter
Sizes in This Series
Polypropylene compression x male NPT adapters. Jump to another size or add it straight to your cart:
| Size | Part # | Price | Cart |
| 1/4 in. x 1/8 in. (this page) | 17179P | $1.99 | — |
| 3/8 in. x 1/2 in. | 17190P | $4.99 | Add to cart |
Overview
The Midland 17179P is a 1/4 in. compression x 1/8 in. male NPT adapter molded in polypropylene, with a 7/16-24 x 1/8-27 thread combination. It joins 1/4 in. OD tubing to a 1/8 in. male NPT port without solder or flare tools, making it a clean choice for small-bore chemical metering and dosing lines where metal fittings would corrode.
Technical Specifications
| Part Number | 17179P |
| Tube Size | 1/4 in. compression |
| Thread Size | 1/8 in. male NPT (7/16-24 x 1/8-27) |
| Fitting Type | Adapter |
| Material | Polypropylene |
| Connection | Compression x Male NPT |
Materials of Construction
| Body | Polypropylene |
| Nut & Sleeve | Polypropylene |
Typical Applications
Used to connect 1/4 in. tubing to 1/8 in. NPT ports on chemical metering pump heads, injection quills, calibration columns, and small dosing skids. Polypropylene shrugs off sodium hypochlorite, acids, and caustics that attack brass, so this adapter is a frequent pick for water-treatment and pool/spa feed lines.
Cross-Reference and Interchange
This polypropylene compression adapter cross-references to these competitor and industry part numbers: 10-4-2P-0, 5016K411. Replacing one of these? Match nominal size, connections, and rating, or send us your part number and we will confirm the interchange.
Sizing and Installation Resources
- Compression Fitting Sizing Chart
- Metering Pump Chemical Compatibility Chart
- Chemical Compatibility Chart for Fluid Handling
- NPT Thread Tightening: Turns Past Hand-Tight
- Teflon Tape vs. Pipe Dope
Frequently Asked Questions
Does this adapter need thread sealant?
Yes. Apply PTFE tape or a compatible pipe dope to the 1/8 in. male NPT threads, then tighten one to two turns past hand-tight.
What tubing does it fit?
It accepts 1/4 in. OD semi-rigid tubing such as polyethylene or nylon; tighten the compression nut to seat the sleeve onto the tube.
Is polypropylene chemical-safe for bleach?
Yes, polypropylene handles sodium hypochlorite well, which is why it is preferred over brass on chlorine feed lines.
WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.