Why Pneumatic Fittings Leak and How to Prevent It
Understand the most common causes of pneumatic fitting leaks, from poor tube cuts and wrong threads to side load, seal wear, vibration, and low-quality fittings.
Views: 46 2026-06-19
Understand the most common causes of pneumatic fitting leaks, from poor tube cuts and wrong threads to side load, seal wear, vibration, and low-quality fittings.
A clear explanation of common pneumatic fitting thread types, sealing methods, and how to avoid costly mismatches in compressed air equipment.
Learn how push to connect pneumatic fittings seal, lock tubing, speed up assembly, and simplify maintenance in modern compressed air systems.
A practical guide to choosing pneumatic fittings for compressed air systems, covering fitting style, tube size, thread type, sealing, layout, and supplier quality.
Specification Parameters Operating Fluid Air, Vaccum, Water(no freezing) Body Material Brass Type Pneumatic Fittings Proof Pressure 1.32 MPa (13.5 kgf/cm²) Max. Operating Pressure 0~0.9 MPa (0~9.2 kgf/cm²) Ambient & Fluid Temperature 0~60°C Lock Claw Stainless Steel(SUS) Applicable Tubing PU Tube, Nylon Tube Model Φ D × 2 B E M H × 2 PM-4 4 28.5 8 M12×1 14 PM-6 6 31.5 10 M14×1 17 PM-8 8 33.5 11 M16x1 19 PM-10 10 37 12 M20x1 24 PM-12 12 40 14 M22× 1 27 Key Features Bulkhead straight union structure Tube-to-tube connection through panel Push-to-connect quick installation Leak-proof sealing with O-ring Durable brass and engineering plastic construction Applications Pneumatic control panels Industrial automation systems Air distribution pipelines Machinery equipment Robotics and assembly lines Widely used in pneumatic systems requiring tube routing through panels, organized piping layout, and reliable air-tight connection. Product Function PM bulkhead union fittings are used to connect two tubes on both sides of a panel or barrier, allowing air lines to pass through obstacles safely and securely. Product Structure & Size Range PM4 / PM6 / PM8 /…
Specification Parameters Operating Fluid Air Type Pneumatic Fittings Proof Pressure 1.32 MPa (13.5 kgf/cm²) Max. Operating Pressure 0~0.9 MPa (0~9.2 kgf/cm²) Ambient & Fluid Temperature 0~60°C Applicable Tubing PU Tube, Nylon Tube Model ØD1 ØD2 B ØP ×2 PG6-4 6 4 35 13 PG8-6 8 6 37.5 15 PG8-4 8 4 37 15 PG10-8 10 8 44 18.5 PG10-6 10 6 43.5 18.5 PG12-10 12 10 47.5 21 PG12-8 12 8 46.5 21 PG12-6 12 6 46 21 PG14-12 14 12 48 23 PG14-10 14 10 48 23 PG16-14 16 14 52.5 25.5 PG16-12 16 12 52 25.5 Color options available: Key Features Straight reducer (different diameter connection) Push-to-connect quick installation Smooth airflow transition between tube sizes Leak-proof sealing with O-ring Suitable for PU and nylon tubing Applications Pneumatic automation systems Air compressor pipelines Industrial machinery Tube size conversion systems Maintenance and retrofit pipelines Widely used in pneumatic systems requiring tube size conversion, flexible pipeline design, and stable airflow transition. Product Function PG fittings are designed to connect two tubes of different diameters inline, enabling smooth transition between different pipe sizes…
Specification Parameters Operating Fluid Air Type Pneumatic Fittings Proof Pressure 1.32 MPa (13.5 kgf/cm²) Max. Operating Pressure 0~0.9 MPa (0~9.2 kgf/cm²) Ambient & Fluid Temperature 0~60°C Applicable Tubing PU Tube, Nylon Tube Model ΦD E B ΦP A R H PLF4-M5 4 18 18.5 11 4.5 M5 10 PLF4-01 4 18 22.5 11 8 R1/8 12 PLF4-02 4 18 24 11 9.5 R1/4 15 PLF6-M5 6 20 20.5 13 4.5 M5 12 PLF6-01 6 20 24.5 13 8 R1/8 12 PLF6-02 6 20 26 13 9.5 R1/4 15 PLF6-03 6 20 27 13 10.5 R3/8 19 PLF6-04 6 20 28 13 11.5 R1/2 24 PLF8-01 8 22 24.5 15 10.5 R1/8 14 PLF8-02 8 22 28 15 9.5 R1/4 15 PLF8-03 8 22 29 15 10.5 R3/8 24 PLF8-04 8 22 30 15 11.5 R1/2 19 PLF10-01 10 26 27.5 18.5 8 R1/8 17 PLF10-02 10 26 27.5 18.5 11 R1/4 17 PLF10-03 10 26 32 18.5 10.5 R3/8 19 PLF10-04 10 26 33 18.5 11.5 R1/2 24 PLF12-01 12 28 29.5 21 8 R1/8 19 PLF12-02 12 28 29.5…
Specification Parameters Operating Fluid Air Type Pneumatic Fittings Proof Pressure 1.32 MPa (13.5 kgf/cm²) Max. Operating Pressure 0~0.9 MPa (0~9.2 kgf/cm²) Ambient & Fluid Temperature 0~60°C Applicable Tubing PU Tube, Nylon Tube Model A B ØC PP-4 30.5 16 4 PP-6 31.5 17 6 PP-8 33.5 18 8 PP-10 41.5 24 10 PP-12 43 25 12 Color options available: Key Features Push-to-connect tube plug design Seals unused pneumatic tubing Prevents air leakage and pressure loss Suitable for PU and nylon tube Easy installation and removal Applications Pneumatic automation systems Air compressor pipelines Equipment maintenance and testing Temporary air line sealing Unused port protection Widely used in pneumatic systems requiring air sealing, pipeline isolation, and leak prevention. Product Function PP fittings are used to close unused air tube ends or ports, preventing air leakage and maintaining system pressure stability. Product Structure & Size Range PP4 / PP6 / PP8 / PP10 / PP12 Tube sizes: 4mm → 12mm Push-in plug structure Compact sealing design Why Choose Our Pneumatic Fittings Professional PP pneumatic plug manufacturer OEM / ODM customization for air tube plug…
Specification Parameters Operating Fluid Air Type Pneumatic Fittings Proof Pressure 1.32 MPa (13.5 kgf/cm²) Max. Operating Pressure 0~0.9 MPa (0~9.2 kgf/cm²) Ambient & Fluid Temperature 0~60°C Applicable Tubing PU Tube, Nylon Tube Model Φ D × 2 E B Φ P ×2 PA-4 4 39.5 29 11 PA-6 6 46 39 13.5 PA-8 8 50 39 16.5 PA-10 10 60 45 19.5 PA-12 12 63 47.5 21.5 Explore Our Nickel-Plated Brass Series Key Features Inline pipeline air valve design Direct installation into pneumatic tubing Manual airflow control or shut-off Compact structure for space saving Durable construction with reliable sealing Applications Pneumatic automation systems Air distribution pipelines Industrial machinery Robotics systems Packaging and assembly equipment Widely used in pneumatic systems requiring inline airflow control, simplified piping layout, and reliable air regulation. Product Structure & Types Inline straight air valve Push-to-connect tube valve Manual control valve Available sizes: 4mm / 6mm / 8mm / 10mm / 12mm 👉 Pneumatic systems rely on valves to control airflow and system operation Why Choose Our Pneumatic Valve Professional PA pneumatic valve manufacturer with full size…
Specification Parameters Operating Fluid Air Type Pneumatic Fittings Proof Pressure 1.32 MPa (13.5 kgf/cm²) Max. Operating Pressure 0~0.9 MPa (0~9.2 kgf/cm²) Ambient & Fluid Temperature 0~60°C Applicable Tubing PU Tube, Nylon Tube Model ΦD×2 E P A R H PX4-M5 4 37 11 3.5 M5 10 PX4-01 4 40.5 11 7 R1/8 10 PX4-02 4 51.5 11 8 R1/4 14 PX6-M5 6 40 13 3.5 M5 12 PX6-01 6 43.5 13 7 R1/8 12 PX6-02 6 44.5 13 8 R1/4 14 PX6-03 6 45.5 13 9 R3/8 17 PX6-04 6 47 13 10 R1/2 21 PX8-01 8 47.5 15 7 R1/8 14 PX8-02 8 48.5 15 8 R1/4 14 PX8-03 8 49.5 15 9 R3/8 17 PX8-04 8 51 15 10 R1/2 21 PX10-01 10 51.5 18.5 7 R1/8 17 PX10-02 10 52.5 18.5 8 R1/4 17 PX10-03 10 53.5 18.5 9 R3/8 17 PX10-04 10 55 18.5 10 R1/2 21 PX12-01 12 54 21 7 R1/8 19 PX12-02 12 55 21 8 R1/4 19 PX12-03 12 56 21 9 R3/8 19 PX12-04 12 57.5 21 10 R1/2 21 PX14-02…
Specification Parameters Operating Fluid Air Type Pneumatic Fittings Proof Pressure 1.32 MPa (13.5 kgf/cm²) Max. Operating Pressure 0~0.9 MPa (0~9.2 kgf/cm²) Ambient & Fluid Temperature 0~60°C Applicable Tubing PU Tube, Nylon Tube Model A E C ØD ×2 ØP×2 BUC-4 55.5 23.5 35 4 18 BUC-6 57 23.5 35 6 18 BUC-8 57 23.5 35 8 18 BUC-10 69 27 42 10 24 BUC-12 70 27 42 12 24 Color options available Key Features Inline air shut-off valve design Push-to-connect quick installation Manual ON/OFF control with lever Ball valve structure for tight sealing Suitable for PU and nylon tubing Applications Pneumatic automation systems Air compressor pipelines Industrial machinery Maintenance isolation systems Air supply control circuits Widely used in pneumatic systems requiring direct inline airflow control, fast shut-off, and easy maintenance operation. Product Function BUC valves are designed to control or completely shut off airflow inside pneumatic tubing, allowing safe maintenance and flexible system control. Product Structure & Size Range BUC4 / BUC6 / BUC8 / BUC10 / BUC12 Tube sizes: 4mm → 12mm Inline straight structure Manual lever control Why Choose…
Specification Parameters Operating Fluid Air Type Pneumatic Fittings Proof Pressure 1.32 MPa (13.5 kgf/cm²) Max. Operating Pressure 0~0.9 MPa (0~9.2 kgf/cm²) Ambient & Fluid Temperature 0~60°C Applicable Tubing PU Tube, Nylon Tube Model Φ D × 2 B A Φ P ×2 HVFF-4 4 45.5 40 11 HVFF-6 6 46.5 40 13 HVFF-8 8 50 42.5 15 HVFF-10 10 60.5 42.5 18.5 HVFF-12 12 63.5 44.5 21 Color Options： Key Features 2-way manual air control valve Built-in exhaust (venting) function Push-to-connect quick installation Compact and durable structure Suitable for PU and nylon tubing 👉 HVFF valves allow air shut-off with pressure release, preventing trapped air in the system Applications Pneumatic automation systems Air compressor pipelines Industrial machinery Maintenance isolation systems Vacuum and air control circuits Widely used in pneumatic systems requiring manual airflow control, pressure release, and safe maintenance operation. Why Choose Our Pneumatic Valve Professional HVFF pneumatic hand valve manufacturer with full size range OEM / ODM customization for 3 way air shut-off valve projects Reliable pneumatic valve with exhaust function for industrial systems High-quality push to connect air…
