3/8 in. x 1/2 in. Compression x Male NPT Polypropylene Adapter
3/8 in. x 1/2 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. | 17179P | $1.99 | Add to cart |
| 3/8 in. x 1/2 in. (this page) | 17190P | $4.99 | — |
Overview
The Midland 17190P is a 3/8 in. compression x 1/2 in. male NPT adapter molded from polypropylene, with a 9/16-24 x 1/2-14 thread combination. It steps 3/8 in. OD tubing up to a 1/2 in. male NPT port, giving chemical feed and transfer lines a corrosion-proof connection that brass cannot match around hypochlorite and acids.
Technical Specifications
| Part Number | 17190P |
| Tube Size | 3/8 in. compression |
| Thread Size | 1/2 in. male NPT (9/16-24 x 1/2-14) |
| Fitting Type | Adapter |
| Material | Polypropylene |
| Connection | Compression x Male NPT |
Materials of Construction
| Body | Polypropylene |
| Nut & Sleeve | Polypropylene |
Typical Applications
Connects 3/8 in. tubing to 1/2 in. NPT ports on metering pumps, day tanks, strainers, and chemical injection assemblies. Common in municipal water and wastewater dosing, cooling-tower treatment, and other fluid-handling skids where the larger 1/2 in. port and aggressive chemistry rule out metal fittings.
Cross-Reference and Interchange
This polypropylene compression adapter cross-references to these competitor and industry part numbers: 10-6-8-P-0, 5016K446. 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
Will polypropylene hold up to bleach and acids?
Yes. Polypropylene resists sodium hypochlorite, sulfuric and hydrochloric acid, and caustics that corrode brass fittings.
What size tubing does it accept?
It is built for 3/8 in. OD semi-rigid tubing; the compression nut and sleeve seal onto the tube wall when tightened.
Do I seal the NPT threads?
Yes, wrap the 1/2 in. male NPT with PTFE tape or apply pipe dope, then run it one to two turns past hand-tight.
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.