Reducer Straight Push-In Fittings — Connect Different-Diameter Pneumatic Tubes Without Adapters
When your pneumatic system calls for two tubes of different sizes to meet in a straight line, a mismatched connection can mean air leaks, pressure drops, and frustrating downtime. Whether you're building a compressed-air circuit in your workshop, routing lines on an automation panel, or repairing an existing pneumatic system, these reducer straight push-in fittings give you a clean, reliable solution without hunting for adapters or machining custom parts.
Each fitting is a single-piece reducer straight connector with two push-in ports of different outer diameters. Available in sizes ranging from 6mm–4mm up to 16mm–12mm (approximately 1/4"–5/32" up to 5/8"–15/32"), these fittings accept standard metric OD pneumatic tubing — polyurethane (PU), nylon (PA), and polyethylene (PE). Sold individually or in value packs of 5, 10, or 20 pieces to suit both one-off repairs and larger builds.
Typical use cases include connecting mismatched tube runs in DIY pneumatic circuits, stepping down line diameter to reduce flow to a specific actuator or valve, and replacing damaged inline reducers in industrial or workshop air systems — all scenarios where a reliable reducer push-in tube connector saves time and eliminates the need for threaded adapters.
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Compatibility: Designed for standard metric OD pneumatic tubing (PU, PA, PE). Size format is Large Port OD × Small Port OD — e.g., "10mm-6mm" connects a 10mm OD tube to a 6mm OD tube. Always measure tube outer diameter before ordering.
✅ Key Features of These Reducer Straight Push-In Fittings
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🔗True Reducer Design — Each fitting has two different-diameter push-in ports, allowing direct tube-to-tube connection between mismatched OD pneumatic lines without additional adapters or couplings.
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⚡Tool-Free Push-To-Connect Installation — Insert the tube straight into the collet until it seats; the stainless collet teeth grip and seal automatically. Release by pressing the collet ring and pulling the tube — no wrenches, clamps, or thread tape needed on the tube side.
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💧O-Ring Sealed for Leak-Free Performance — An internal elastomeric O-ring creates a positive air seal around the tube OD, maintaining consistent pressure in your pneumatic circuit even under vibration or movement.
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📐Wide Size Range — 6mm to 16mm OD — Eleven size combinations from 6mm-4mm through 16mm-12mm cover the most common metric tube reducer push-in fitting needs in workshop, automation, and light industrial applications.
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🏭Engineering-Grade Body Construction — The fitting body is typically formed from reinforced nylon or acetal, offering resistance to oils, mild chemicals, and the mechanical stresses common in compressed-air environments.
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📦Flexible Pack Quantities — Available in 1, 5, 10, or 20-piece packs so you can grab a single replacement or stock up for a full pneumatic panel build — whichever makes sense for your project.
📐 Technical Specifications — Reducer Straight Push-In Tube Fittings
| Fitting Type |
Reducer Straight Push-In (Inline Reducer) |
| Connection Method |
Push-to-connect (collet-style, tool-free tube insertion) |
| Port Configuration |
Two push-in ports — one large OD, one small OD |
| Available Sizes (Large OD × Small OD) |
6mm-4mm, 8mm-4mm, 8mm-6mm, 10mm-6mm, 10mm-8mm, 12mm-6mm, 12mm-8mm, 12mm-10mm, 14mm-12mm, 16mm-10mm, 16mm-12mm |
| Compatible Tube Types |
PU (polyurethane), PA (nylon), PE (polyethylene) — metric OD |
| Body Material |
Engineering-grade nylon or acetal (see variant options) |
| Seal Type |
Internal elastomeric O-ring |
| Collet Material |
Stainless steel or nickel-plated (see variant options) |
| Working Pressure |
Typically up to 150 PSI (≈10 bar) — contact us to confirm for your size |
| Working Temperature |
Generally 0°C to 60°C (32°F to 140°F) for standard pneumatic air service |
| Pack Quantities Available |
1 Pc, 5 Pcs, 10 Pcs, 20 Pcs |
| Application |
Pneumatic air lines, compressed-air circuits, automation panels, workshop plumbing |
| Country of Origin |
See variant options |
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Size Note: The size designation refers to tube outer diameter (OD), not inner diameter. If you are unsure of your tube OD, measure with calipers before ordering. For inch-size tubing, use the conversion guide in the FAQ below.
❓ Frequently Asked Questions
How do I choose the right reducer fitting size?
Measure the outer diameter (OD) of both tubes you need to connect. The first number in the size designation is the larger port OD, and the second is the smaller port OD. For example, if you're connecting a 10mm tube to a 6mm tube, select the 10mm-6mm variant. Always measure OD — not inner diameter — with calipers for accuracy.
What is the maximum working pressure these fittings can handle?
Reducer push-in fittings of this type are generally rated for working pressures up to approximately 150 PSI (≈10 bar) under normal pneumatic conditions. Actual ratings may vary by size. Contact us to confirm for your specific application if operating near pressure limits.
Can these fittings be used outdoors or in humid environments?
These fittings are typically constructed with an engineering-grade nylon or acetal body and an internal O-ring seal, making them suitable for indoor industrial and workshop environments. For prolonged outdoor exposure or high-humidity conditions, contact us to confirm suitability before ordering.
Are these fittings compatible with standard pneumatic tubing?
Yes. These reducer push-in fittings work with standard metric OD pneumatic tubing including polyurethane (PU), nylon (PA), and polyethylene (PE) tubing. The size designation refers to tube outer diameter in millimeters, which is the standard metric pneumatic convention used across most workshop and automation equipment.
Do I need any tools or thread tape to install these fittings?
No tools are required for tube insertion — simply push the tube straight into the collet until it seats fully. To release, press the collet ring inward while pulling the tube out. These are push-to-connect fittings with no threading on the tube side, so no thread tape is needed for the tube connection.
Which size should I buy for connecting a 3/8" tube to a 1/4" tube?
3/8" OD is approximately 9.5mm (≈3/8") and 1/4" OD is approximately 6.35mm (≈1/4"). In metric sizing, the closest standard combination would generally be the 10mm-6mm variant. We recommend verifying your tube's actual OD with calipers before ordering to ensure a secure, leak-free fit.
Can these fittings be reused after removal?
Yes, push-in fittings are generally reusable. However, repeated insertions and removals can cause wear on the collet teeth and O-ring over time. Inspect the fitting and tube end for damage before reuse. If the tube end is nicked or deformed, cut a fresh, clean square end before reinserting for the best seal.
How many fittings do I need for a typical pneumatic panel build?
This depends on your circuit layout. For a small workshop setup with a few actuators, a 5- or 10-piece pack of the most common sizes (typically 8mm-6mm or 10mm-8mm) is usually sufficient. For larger automation panels or production line builds, the 20-piece packs offer better per-unit value. We recommend mapping your circuit first and counting reducer points before ordering.
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