Pneumatic Push-In Fittings — Leak-Free One-Touch Connections for Air Lines & Water Hoses
Dealing with leaky hose joints, slow air-line repairs, or mismatched tube sizes on your pneumatic or water system? These pneumatic push-in fittings are built for technicians, maintenance crews, and serious DIYers who need a fast, reliable connection without threading tools or clamps. Whether you are routing compressed air through a workshop or connecting water lines in a tight cabinet, the right fitting makes the difference between a clean install and a frustrating leak.
Each fitting is a single-piece push-in connector available in three series — PG (reducer union, two different tube ODs), PU (straight union, single tube OD), and PE (elbow/end style) — covering tube outer diameters from 4mm (≈5/32") to 16mm (≈5/8"). The body is constructed from engineering-grade polymer with a stainless-steel collet and NBR O-ring for a secure, tool-free grip. Available in pack quantities of 1, 2, 3, 4, 5, 10, or 50 pieces to match your project scale.
Typical use cases include compressed-air distribution lines in workshops and factories, pneumatic cylinder and valve plumbing, water filtration and RO system tubing, and irrigation control manifolds — anywhere a fast-connect metric tube fitting for air or water is needed.
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Compatibility: Designed for metric OD pneumatic tubing (polyurethane, nylon, polyethylene) — 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, and 16mm OD. Confirm your tube OD before selecting a size. Not designed for imperial (inch) tubing without verification.
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Size selection tip: For PG reducer fittings, the first number is the larger tube OD and the second is the smaller tube OD (e.g., PG 12-8 connects a 12mm tube to an 8mm tube). For PU straight fittings, both ends accept the same OD. If unsure, measure your tube with calipers before ordering.
✅ Key Features of These Pneumatic Push-In Fittings
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🔧Tool-Free One-Touch Installation — Push the tube straight in until it clicks; the stainless-steel collet grips automatically, eliminating the need for wrenches, thread tape, or clamps on every connection.
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📐Wide Size Range (4mm–16mm OD) — Three fitting series (PG, PU, PE) cover the most common metric tube sizes used in pneumatic push-in fitting applications, from small instrument lines to larger air supply runs.
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💧Dual-Media Rated — Air & Water — Suitable for both compressed-air systems and low-pressure water line connections, making these fittings versatile across pneumatic and fluid handling setups.
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🔄Reducer Union Design (PG Series) — PG fittings connect two different tube ODs in a single body, reducing the need for adapters when transitioning between tube sizes in a pneumatic distribution system.
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📦Flexible Pack Quantities (1–50 pcs) — Order exactly what your job requires — single pieces for repairs or bulk packs of 50 for production runs and panel builds — with per-unit cost savings at higher quantities.
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🏭Engineering-Grade Polymer Body with NBR O-Ring — The fitting body resists common workshop chemicals and oils; the NBR O-ring maintains a leak-free seal across typical pneumatic operating temperatures and pressures.
📐 Technical Specifications — Pneumatic Push-In Fittings (PG / PU / PE)
| Fitting Series |
PG (reducer union), PU (straight union), PE (elbow/end) |
| Tube OD Range |
4mm (≈5/32") to 16mm (≈5/8") |
| Connection Type |
Push-in / one-touch, tool-free |
| Body Material |
Engineering-grade polymer (typically PA or POM) |
| Collet Material |
Stainless steel |
| Seal Material |
NBR O-ring |
| Compatible Tube Types |
Polyurethane (PU), Nylon (PA), Polyethylene (PE) — metric OD |
| Working Pressure |
Typically up to 150 PSI (≈10 bar) — see variant options |
| Working Temperature |
Contact us to confirm for specific media |
| Media |
Compressed air, water (non-corrosive fluids) |
| Thread Standard |
See variant options |
| Pack Quantities |
1, 2, 3, 4, 5, 10, 50 pcs |
| Color / Finish |
See variant options |
| Certifications |
Contact us to confirm |
❓ Frequently Asked Questions
How do I choose the right fitting size?
Match the first number to your tube outer diameter (OD) and the second number to the port or tube OD you are connecting to. For example, PG 8-6 connects an 8mm OD tube to a 6mm port. Sizes range from 4mm (≈5/32") to 16mm (≈5/8"). If you are unsure, measure your tube OD with calipers before ordering — tube OD is not the same as inner diameter or nominal pipe size.
What is the difference between PG, PU, and PE fittings?
PG fittings are reducer union connectors that join two tubes of different ODs in a straight line. PU fittings are straight union connectors where both ends accept the same tube OD. PE fittings are generally elbow or end-style connectors. All three series use the same push-in, tool-free connection mechanism and are compatible with standard metric pneumatic tubing.
What is the maximum working pressure for these fittings?
Pneumatic push-in fittings of this type typically support working pressures up to approximately 150 PSI (≈10 bar) at room temperature. Actual ratings depend on tube material, tube OD, and operating temperature. Always confirm with your system specifications and do not exceed the rated pressure for your tube and fitting combination.
Can these fittings be used outdoors or in wet environments?
These fittings are generally suitable for water line and pneumatic applications in sheltered or indoor environments. The engineering-grade polymer body resists common oils and workshop chemicals. For prolonged outdoor UV exposure or chemically aggressive media, verify material compatibility with your specific application. The NBR O-ring is generally compatible with water and compressed air.
Are these fittings compatible with standard pneumatic tubing?
Yes. These push-in fittings are designed to work with standard metric OD pneumatic tubing — polyurethane (PU), nylon (PA), and polyethylene (PE) — in sizes 4mm through 16mm. They follow common metric sizing conventions used across most pneumatic systems in industrial and workshop settings. They are not designed for imperial (inch) tubing without verification of OD compatibility.
How do I release the tube from a push-in fitting?
To release the tube: (1) Depressurize the line completely. (2) Press the collet ring inward toward the fitting body. (3) While holding the collet in, pull the tube straight out. No tools are required. Avoid twisting the tube during removal to prevent damage to the collet teeth or the tube surface.
Can I reuse these fittings after disconnecting the tube?
In most cases, push-in fittings can be disconnected and reconnected a limited number of times. However, if the collet teeth show visible wear or the O-ring is damaged or deformed, replace the fitting before returning it to service in a pressurized system. Inspect fittings visually before each reuse.
🛒 Select your fitting size and pack quantity above, then add to cart — ships from our US warehouse.
