McMaster-Carr logo
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    60 Products

    Flow-Control Mufflers

    Adjust the flow by turning the screw. Use these mufflers with air-powered tools and cylinders to reduce noise and filter exhaust fumes.
    Mufflers with External Hex Drive
    Image of Product. NPT Brass. Front orientation. Mufflers. Flow-Control Mufflers, NPT Male Brass Fitting.
    Image of Product. NPT 316 Stainless Steel. Front orientation. Mufflers. Flow-Control Mufflers, NPT Male 316 Stainless Steel Fitting.
    Image of Product. BSPP Nylon. Front orientation. Mufflers. Flow-Control Mufflers, BSPP Male Nylon Fitting.
    Image of Product. Metric Nylon. Front orientation. Mufflers. Flow-Control Mufflers, Metric Male Nylon Fitting.

    NPT Brass

    NPT 316

    Stainless

    Steel

    BSPP Nylon

    Metric

    Nylon

    For mufflers with an external hex drive, twist the screw and then tighten the hex nut with a wrench to secure. These mufflers are more secure than those with a thumb screw.
    Each
    Pipe
    Size
    Thread
    Size
    Max. Flow Rate
    @ Pressure
    Max. Pressure,
    psi
    Max. Temp.,
    ° F
    Ht.
    For Use With
    Removes Particle
    Size Down To, μm
    Noise Reduction
    Rating, dB
    Features
    1-19
    20-Up
    NPT Male Brass Fitting
    1/8
    20 scfm @ 100 psi3003001 5/16"Air, Inert Gas4017 to 20Adjustable Airflow00000000000000000
    1/8
    30 scfm @ 100 psi3003001 9/16"Air, Inert Gas4017 to 20Adjustable Airflow000000000000000
    1/4
    30 scfm @ 100 psi3003001 9/16"Air, Inert Gas4017 to 20Adjustable Airflow000000000000000
    1/4
    40 scfm @ 100 psi3003001 5/8"Air, Inert Gas4017 to 20Adjustable Airflow000000000000000
    3/8
    40 scfm @ 100 psi3003001 5/8"Air, Inert Gas4017 to 20Adjustable Airflow000000000000000
    3/8
    60 scfm @ 100 psi3003002"Air, Inert Gas4017 to 20Adjustable Airflow0000000000000000
    1/2
    60 scfm @ 100 psi3003002"Air, Inert Gas4017 to 20Adjustable Airflow0000000000000000
    1/2
    70 scfm @ 100 psi3003002 3/8"Air, Inert Gas4017 to 20Adjustable Airflow00000000000000000
    3/4
    70 scfm @ 100 psi3003002 3/8"Air, Inert Gas4017 to 20Adjustable Airflow00000000000000000
    1
    100 scfm @ 100 psi3003002 1/2"Air, Inert Gas4017 to 20Adjustable Airflow00000000000000000
     
    NPT Male 316 Stainless Steel Fitting
    1/8
    12 scfm @ 100 psi3003901 1/4"Air, Inert Gas70Adjustable Airflow00000000000000000
    1/4
    25 scfm @ 100 psi3003901 9/16"Air, Inert Gas70Adjustable Airflow00000000000000000
    3/8
    30 scfm @ 100 psi3003901 5/8"Air, Inert Gas70Adjustable Airflow00000000000000000
    1/2
    50 scfm @ 100 psi3003901 15/16"Air, Inert Gas70Adjustable Airflow00000000000000000
    3/4
    70 scfm @ 100 psi3003902 1/4"Air, Inert Gas70Adjustable Airflow00000000000000000
    1
    100 scfm @ 100 psi3003902 3/8"Air, Inert Gas70Adjustable Airflow00000000000000000
     
    BSPP Male Nylon Fitting
    1/8
    51 scfm @ 100 psi14521013/16"Air, Inert Gas7510 to 20Adjustable Airflow000000000000000
    1/4
    99 scfm @ 100 psi1452101 3/16"Air, Inert Gas7510 to 20Adjustable Airflow0000000000000000
    3/8
    170 scfm @ 100 psi1452101 1/2"Air, Inert Gas7510 to 20Adjustable Airflow00000000000000000
     
    Metric Male Nylon Fitting
    M5
    19 scfm @ 100 psi1452105/8"Air, Inert Gas7510 to 20Adjustable Airflow000000000000000
     
    Mufflers with Thumb Screw
    Image of Product. NPT Bronze with Thumb Screw. Front orientation. Mufflers. Flow-Control Mufflers, NPT Male Bronze Fitting.

    NPT

    Bronze

    with

    Thumb

    Screw

    For mufflers with a thumb screw, twist the screw and friction secures them in place—no need to use a wrench. Often used in valve exhaust ports, these mufflers are not as secure as those with a nut.
    Each
    Pipe
    Size
    Max. Flow Rate
    @ Pressure
    Max. Pressure,
    psi
    Max. Temp.,
    ° F
    Ht.
    For Use With
    Removes Particle
    Size Down To, μm
    Noise Reduction
    Rating, dBA
    Features
    1-19
    20-Up
    NPT Male Bronze Fitting
    1/8
    6 scfm @ 100 psi2155701 1/16"Air, Inert Gas3517 to 20Adjustable Airflow, Friction Lock00000000000000000
    1/8
    6 scfm @ 100 psi2155701 3/8"Air, Inert Gas3517 to 20Adjustable Airflow, Friction Lock000000000000000
    1/4
    9 scfm @ 100 psi2155701 3/16"Air, Inert Gas3517 to 20Adjustable Airflow, Friction Lock000000000000000
    1/4
    9 scfm @ 100 psi2155701 9/16"Air, Inert Gas3517 to 20Adjustable Airflow, Friction Lock000000000000000
     

    Air-Exhaust Flow Control Valves

    Image of Product. Dial Flow Adjustment. Front orientation. Contains Annotated. Air-Exhaust Valves. Air-Exhaust Flow Control Valves, Threaded Male Inlet, Flow-Adjustment Dial.
    Image of Product. Slotted Screw Flow Adjustment. Front orientation. Contains Annotated. Air-Exhaust Valves. Air-Exhaust Flow Control Valves, Threaded Male Inlet, Flow-Adjustment Slotted Screw.

    Dial Flow Adjustment

    Slotted Screw Flow

    Adjustment

    Image of Product. Thumb Screw Flow Adjustment. Front orientation. Contains Annotated. Air-Exhaust Valves. Air-Exhaust Flow Control Valves, Threaded Male Inlet, Flow-Adjustment Thumb Screw.
    Image of Specification. Front orientation. Contains Annotated. Air-Exhaust Valves. Air-Exhaust Flow Control Valves.

    Thumb Screw Flow

    Adjustment

    Install these valves in the exhaust ports of air directional control valves to control exhaust air speed without needing access to your cylinder. They control flow in one direction as air moves from the inlet to the exhaust port (meter out). Air flows freely in the opposite direction. Valves exhaust to the atmosphere and include a muffler to reduce the exhaust noise.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve. When selecting between valves with the same port size, choose the valve with the higher flow coefficient to ensure it provides enough airflow to operate your system.
    Overall
    No. of Flow
    Ports
    Inlet
    Size
    Max. Flow Rate
    @ Pressure
    Flow Coefficient
    (Cv)
    Max. Pressure,
    psi
    Body
    Material
    Hex
    Size
    Dia
    Lg.
    Each
    Threaded Male Inlet
     
    Flow-Adjustment Dial
    21/8 BSPP35 scfm @ 100 psi1.016145Aluminum
    16 mm46 mm0000000000000
    21/4 BSPP52.5 scfm @ 100 psi1.524145Aluminum
    19.5 mm63.3 mm000000000000
    23/8 BSPP59.5 scfm @ 100 psi1.728145Aluminum
    25 mm95.3 mm000000000000
    21/2 BSPP141.26 scfm @ 100 psi2.982145Aluminum
    28 mm130 mm0000000000000
    23/4 BSPP268.39 scfm @ 100 psi5.965145Aluminum
    38 mm157 mm0000000000000
     
    Flow-Adjustment Slotted Screw
    21/8 NPT19.21 scfm @ 100 psi0.52145Aluminum
    9/16"5/8"1 5/16"000000000000
    21/8 BSPP19.21 scfm @ 100 psi0.52145Aluminum
    14 mm15 mm27 mm0000000000000
    21/4 NPT37 scfm @ 100 psi1145Aluminum
    11/16"3/4"1 5/8"000000000000
    21/4 BSPP37 scfm @ 100 psi1145Aluminum
    17 mm18.2 mm32.1 mm0000000000000
    23/8 NPT74 scfm @ 100 psi2145Aluminum
    7/8"1"1 15/16"000000000000
    23/8 BSPP74 scfm @ 100 psi2145Aluminum
    22 mm25 mm41.1 mm0000000000000
    21/2 NPT133.2 scfm @ 100 psi3.6145Aluminum
    1 1/16"1 1/16"2 1/4"000000000000
    21/2 BSPP133.2 scfm @ 100 psi3.6145Aluminum
    24 mm27 mm44.6 mm0000000000000
     
    Flow-Adjustment Thumb Screw
    21/8 BSPT10.59 scfm @ 100 psi0.201145Brass10 mm14 mm35.8 mm0000000000000
    21/4 BSPT17.66 scfm @ 100 psi0.313145Brass14 mm18 mm37 mm0000000000000
    2M5 Metric3.35 scfm @ 100 psi0.06145Brass8 mm10 mm23.4 mm0000000000000
    2M7 Metric4.24 scfm @ 100 psi0.075145Brass8 mm10 mm26.9 mm0000000000000
     

    Elbow Air-Exhaust Control Valves with Flow Control

    Image of Product. Front orientation. Contains Annotated. Air-Exhaust Valves. Elbow Air-Exhaust Control Valves with Flow Control.
    Control the flow of exhaust air while also regulating the exhaust air speed. These valves dump exhaust air to the atmosphere without routing it back through a directional control valve. They control flow in one direction as air flows from the inlet to the outlet, and adjust the volume of exhaust air exiting an air cylinder (meter out) to control its speed. Air flows freely in the opposite direction. They have a 90° elbow shape that allows you to install them in tight spaces. The push-to-connect inlet port is for use with plastic or soft metal tubing; insert tubing into the port. A muffler reduces exhaust noise. Also known as quick exhaust valves.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve. When selecting between valves with the same port size, choose the valve with the higher flow coefficient to ensure it provides enough airflow to operate your system.
    Overall
    No. of Flow
    Ports
    For Inlet
    Tube OD
    Outlet
    Size
    For Outlet
    Tube OD
    Max. Flow Rate
    @ Pressure
    Flow Coefficient
    (Cv)
    Pressure Range,
    psi
    Body
    Material
    Lg.
    Wd.
    Ht.
    Each
    Push to Connect Female Inlet × Threaded Male Outlet
     
    Flow-Adjustment Dial
    31/4"1/8 NPT1/4"14.05 scfm @ 100 psi0.4414 to 145Polybutylene2 7/8"11/16"1 1/16"00000000000000
    31/4"1/4 NPT1/4"14.05 scfm @ 100 psi0.4414 to 145Polybutylene2 7/8"11/16"1 1/8"0000000000000
    35/16"1/8 NPT5/16"24.91 scfm @ 100 psi0.7814 to 145Polybutylene2 7/8"15/16"1 3/16"0000000000000
    35/16"1/4 NPT5/16"24.91 scfm @ 100 psi0.7814 to 145Polybutylene3 1/4"15/16"1 3/8"0000000000000
    35/16"3/8 NPT5/16"24.91 scfm @ 100 psi0.7814 to 145Polybutylene3 1/4"15/16"1 1/8"0000000000000
    33/8"1/8 NPT3/8"24.91 scfm @ 100 psi0.7814 to 145Polybutylene3 3/8"15/16"1 5/16"0000000000000
    33/8"1/4 NPT3/8"24.91 scfm @ 100 psi0.7814 to 145Polybutylene3 3/8"15/16"1 5/8"0000000000000
    33/8"1/4 NPT3/8"47.89 scfm @ 100 psi1.514 to 145Polybutylene3 9/16"15/16"1 5/8"0000000000000
    33/8"3/8 NPT3/8"24.91 scfm @ 100 psi0.7814 to 145Polybutylene3 3/8"15/16"1 5/16"0000000000000
    33/8"3/8 NPT3/8"51.09 scfm @ 100 psi1.614 to 145Polybutylene3 9/16"1 3/16"1 3/4"0000000000000
    33/8"1/2 NPT3/8"51.09 scfm @ 100 psi1.614 to 145Polybutylene3 9/16"1 3/16"1 5/8"0000000000000
     

    Made-to-Order Air-Operated Air-Exhaust Control Valves

    Image of Product. Front orientation. Air-Exhaust Valves. Made-to-Order Air-Operated Air-Exhaust Control Valves.
    When these valves receive an air signal, they quickly dump exhaust air to the atmosphere without routing it back through a directional control valve to speed up the movement of equipment. They're often used with air compressors that require continuous operation. A muffler reduces exhaust noise. Also known as quick exhaust valves.
    To Order: Specify minimum pressure and maximum pressure from the ranges listed. The difference between the minimum pressure and maximum pressure must be at least 10 psi, but no more than 30 psi.
    Overall
    No. of Flow
    Ports
    Inlet Pipe
    Size
    For Outlet
    Tube ID
    Air Pilot
    Size
    Max. Flow Rate
    @ 100 psi, scfm
    Flow Coefficient
    (Cv)
    Body
    Material
    Lg.
    Wd.
    Ht.
    Lowest Avail.
    Pressure, psi
    Highest Avail.
    Pressure, psi
    Each
    Threaded Female Inlet × Barbed Male Outlet × Threaded Male Air Pilot
    4NPT, 1/8
    1/4"1/4 NPT20Not RatedBrass2 7/8"2 1/16"3 3/8"40 to 50240 to 2500000000000000
     

    Clog-Resistant Mufflers

    Image of Product. Style A. Front orientation. Mufflers. Clog-Resistant Mufflers, Mufflers with Pipe Connection, Style A, NPT Male Zinc-Plated Steel Fitting, Zinc-Plated Steel Body.

    Style

    A

    Replace your muffler less often—these have a filter design that stays clean longer than porous mufflers. They’re often used in air-powered circuits to reduce noise and filter exhaust fumes.
    Mufflers with Pipe Connection
    Image of Product. Style A. Front orientation. Mufflers. Clog-Resistant Mufflers, Mufflers with Pipe Connection, Style A, NPT Male Zinc-Plated Steel Fitting, Zinc-Plated Steel Body.

    Style

    A

    Style A—Style A have a screw on top to adjust air flow.
    Pipe
    Size
    Max. Flow Rate
    @ Pressure
    Max. Pressure,
    psi
    Max. Temp.,
    ° F
    Ht.
    For Use
    With
    Body Material
    Removes Particle
    Size Down To, μm
    Noise Reduction
    Rating, dBA
    Each
    Style A
     
    NPT Male Zinc-Plated Steel Fitting
    1/8
    35 scfm @ 100 psi1504001 1/16"AirZinc-Plated Steel90012 to 15000000000000
    1/4
    52 scfm @ 100 psi1504001 5/8"AirZinc-Plated Steel90012 to 15000000000000
     

    Quiet Air-Exhaust Control Valves

    Image of Product. Front orientation. Contains Annotated. Air-Exhaust Valves. Quiet Air-Exhaust Control Valves.
    A muffler on these valves reduces exhaust noise. They allow airflow into your equipment and then quickly vent exhaust air to the atmosphere without routing it back through a directional control valve to speed up the movement of equipment. Also known as quick exhaust valves.
    Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve. When selecting between valves with the same port size, choose the valve with the higher flow coefficient to ensure it provides enough airflow to operate your system.
    Overall
    No. of Flow
    Ports
    For Inlet
    Tube OD
    For Outlet
    Tube OD
    Max. Flow Rate
    @ Pressure
    Flow Coefficient
    (Cv)
    Pressure Range,
    psi
    Body
    Material
    Lg.
    Wd.
    Ht.
    Each
    Push to Connect Female Inlet × Push to Connect Female Outlet
    31/4"1/4"6.82 scfm @ 100 psi0.5414 to 145Polybutylene1 5/8"1/2"5/8"0000000000000
    31/4"1/4"11.36 scfm @ 100 psi0.814 to 145Polybutylene2"1/2"3/4"000000000000
    34 mm4 mm4.47 scfm @ 100 psi0.1414 to 145Polybutylene39.7 mm10 mm14.3 mm000000000000
    36 mm6 mm4.79 scfm @ 100 psi0.1514 to 145Polybutylene41.3 mm11.6 mm15.9 mm000000000000
    36 mm6 mm11.36 scfm @ 100 psi0.814 to 145Polybutylene44.5 mm11.6 mm19 mm000000000000
     
    back to top