Therwen 4 Sets Iron NPT Air Hose Fittings with Safety Locks




Keep your shop air supply flowing safely and securely with the Therwen 4 piece air hose fitting set. This heavy-duty kit contains everything needed to make quick leak-free connections between 3/4″ industrial air hoses and pneumatic equipment.

The corrosive resistant iron construction and galvanized finish stand up to years of use and abuse. No more rounding off soft brass fittings that fail under pressure. The sturdy NPT threads bite in tight for reliable high-pressure connections up to 150 PSI.

Built Tough for Heavy Duty Air

Each Chicago fitting has twin extended lugs designed to handle high volume airflow without restrictive bends. Smooth contoured surfaces maintain maximum airflow efficiency. Just what you need for operating high CFM air tools and industrial spray painting rigs.

Under the glossy galvanized finish, the rugged iron body shrugs off impacts and resists rust and corrosion. The thick walled construction is rated for pressures exceeding 150 PSI for safety and reliability. Compare that to cheaper zinc or plastic fittings.

Slip on the included rubber washers to protect mating surfaces and prevent galling. The specially compounded rubber seals out moisture for connections that stay air-tight in any workshop environment.

Foolproof Safety Locks

Tired of air hoses accidentally pulling loose and rampaging around the shop? The spring-loaded safety locks positively retain air lines with a simple twist. Just insert the lock pin through the lug hole and twist 90 degrees to engage. Reverse the action to detach the hose when needed.

The unique locks prevent hoses decoupling due to vibration or motion. Use them anywhere you need to secure air lines like CNC work centers, auto body bays, or portable air compressors. The safety and security gives you peace of mind to focus on the job, not your air fittings.

Universal Connections

The Chicago style couplings work with all common 3/4″ industrial air hoses and accessories. Each fitting has both internal and external pipe threads for mating female or male threaded equipment.

Use them to:

  • Join air hoses of different gender ends
  • Adapt hose connections to shop air reels and drops
  • Connect air tools like spray guns, sanders, and drills
  • Attach pneumatic actuators and control valves

Standard NPT threads ensure full compatibility with fittings from other brands too. Just use a small amount of thread sealant and tighten until snug.


  • Fitting Material: Iron with galvanized finish
  • Working Pressure: 150 PSI max
  • Thread Size: 3/4″ NPT internal and external
  • Dimensions:
    • Length: 3.2 inches
    • Width: 2.3 inches
    • Lug Size: 1.7 x 0.6 inches
  • Kit includes:
    • 4 x Galvanized iron Chicago couplings
    • 4 x Rubber gasket washers
    • 4 x Safety lock pins

With this complete air connector set, you’ll have dependable workshop air connections for every project.

Customer Support

We provide friendly customer service and free installation advice 7 days a week. Just contact us through the Amazon messaging system. Our 12 month hassle-free warranty covers material defects and quality issues. We want you to be fully satisfied with your air hose fittings.

Bring home consistent, leak-free shop air today by adding the Therwen 4 piece air hose connector set to your cart now!


There are no reviews yet.

Be the first to review “Therwen 4 Sets Iron NPT Air Hose Fittings with Safety Locks”

Your email address will not be published. Required fields are marked *