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Dick's GasMaskParts.com has a wide selection of repair and replacement parts available for your M40 Series Gas Masks and respirators, including the M40 Gas Mask, M40A1 Gas Mask, the 3M FR-M40 Gas Mask (FR-M40-10, FR-M40-20, & FR-M40-30).
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5-Strap Head Harness for M40 gas masks
List Price: $23.95
Our Price: $19.95
Savings: $4.00

New military issue 5-strap head harness (headstrap) for the M40 gas mask.

Consists of rectangular piece of webbing 2" x 3-3/8"; with 5 elastic straps, 6 metal clips, and one 3" donning loop. Constructed of elastic webbing sewn to a rectangular head pad and buckled to facepiece. The ends of the head harness straps have metal strap end clips to prevent fraying of the elastic webbing. Ends of the head harness straps pass through buckles at the two forehead, temple and cheek positions. Elastic webbing
connects the two forehead straps and holds them in proper alignment when the mask assembly is worn. Head harness straps attached to buckles at the ends of the tabs permit adjustment to obtain proper fit of the mask assembly.

Material consists of polyester, cotton and nylon. Black in color. Polyester thread. Webbing is nylon and elastic.

Fits M40 series gas masks, M40A1, M42, M42A1, plus the 3M FR-M40 masks including FR-M40-10, FR-M40-20, & FR-M40-30, and many other masks.
CamelBak HydroLink Gas Mask Adapter, Type M, fits Millennium, M17, M40 Series, MCU2P, M70 Series, and C4 (Canada) protective masks (M95 requires additional adapter)
CamelBak HydroLink Gas Mask Adapter, Type M
Our Price: $24.95

CamelBak HydroLink Gas Mask Adapter, Type M, fits Millennium, M17, M40 Series, MCU2P, M70 Series, and Canadian C4 gas masks
Deflector, Post, Sub-assembly for M40 Gas Masks
Our Price: $23.95

Deflector, Post, Sub-assembly for M40 Gas Masks - new

NSN 4240-01-267-8161
Part # 5-1-1050-10

Fits M40 Series Gas Masks (M40 gas mask, M40A1, M42, M42A1, and the 3M FR-M40 including FR-M40-10, FR-M40-20, & FR-M40-30 gas masks and respirators)
Electronic Voice Amplifier for M40/42 Series Protective Gas Mask
Our Price: $119.95

Brand New, sealed unused condition Electronic Voice Amplifier for M40/42 Series Protective Mask Gas Mask.
Inlet / Outlet Valve Kit for 3M M40 and MSA MCU-2/P Gas Masks
Our Price: $49.95

Gas Mask Repair Kit containing two (2) Exhalation / Outlet Valves and two (2) Inhalation / Inlet Valves.
Inlet Valve Disk for M40 Series Gas Masks, NSN 4820-01-260-8710, Part # 5-1-1055
Inlet Valve Disk for M40 Series Gas Masks
Our Price: $9.95

New Inlet Valve Disk is approximately 1.23 inches outside diameter by .11 inches thick with a .095 inch center hole, and is made from silicone rubber. This inlet disk valve goes between the deflector, post sub-assembly (NSN 4240-01-267-8161) and the valve body (NSN 4820-01-226-7005).

Fits the M40 series gas mask, including the M40 gas mask, M40A1, M42, and M42A1, plus the 3M FR-M40 respirators including the FR-M40-10, FR-M40-20, & FR-M40-30.
Internal Drink Tube for M40 Gas Mask/M45 Gas Mask
Our Price: $15.95

New U.S. Military Issue M40 or M45 Gas Mask Internal Drinking Tube
Laser Ballistic Outserts for M40 Series Gas Masks
Our Price: $159.95

M40/M42 SERIES LASER/BALLISTIC OUTSERT (LBO):
M1 Canteen Cap for M40, M42, M45, M17, MCU gas masks
Our Price: $14.95

M1 Canteen Cap for M40, M42 and M45, M17, MCU Gas Masks, MSA Millenium, and the 3M FR-M40 masks like FR-M40-10, FR-M40-20, & FR-M40-30. NSN 8465-00-930-2077. Part MIL-C-51278. Fits 1 quart or 2 quart water canteens.
M40 Gas Mask Operators Manual TM 3-4240-300-10-1
M40 Gas Mask Operators Manual TM 3-4240-300-10-1 Printed
Our Price: $12.95

M40 Gas Mask Operators Manual TM 3-4240-300-10-1 Printed
M40 Gas Mask Operators Manual TM 3-4240-346-20
Our Price: $2.95

U.S. Military M40A1 & M42A2 (TM 3-4240-346-20) gas mask operators manual.
M40 Head Harness Assembly - Skull Cap Style Headstrap
Our Price: $29.95

New Advanced Skull Cap Head Harness Assembly fits the M40 series gas masks, M40A1, M42, M42A1, plus the 3M FR-M40 masks including FR-M40-10, FR-M40-20, & FR-M40-30, and the MCU gas masks. It may also fit other gas masks and respirators.

Head harness straps attached to buckles at the ends of the tabs permit adjustment to obtain proper fit of the mask assembly. It is essential that the head harness be in excellent shape in order to obtain a proper safe fit.

This gas mask skull cap headstrap is very comfortable, can be worn by anyone, and is also assigned to the hard-to-fit U.S. Military soldiers who can not obtain a proper face seal with the standard strap-type head harness.
M40 Tinted Outserts Neutral Grey Eyepiece Lenses
Our Price: $24.95
Sale Price: $15.95
Savings: $9.00

M40 TINTED OUTSERTS NEUTRAL GREY EYEPIECE LENSES
M40A1 Optical Insert Kit - Fits M40 Series Gas Masks
Our Price: $109.95
Sale Price: $89.95
Savings: $20.00

Unissued U.S. M40A1 / M40 series Optical Insert Kit consists of a prescription lens carrier and mounting frame.
Microphone Diaphragm Side Voicemitter for M40 gas masks
Our Price: $29.95

Microphone Diaphragm Side Voicemitter for M40 gas masks, also fits M17 & M9 series gas masks, and 3M FR-M40 respirators.
Nosecup Valve Disks for M40 Series Gas Masks (Pair)
Our Price: $24.95

Nosecup Valve Disks for M40 Series Gas Masks (Pair), NSN 4820-01-260-8703, Part 5-1-1081. fits the M40 series gas mask, including the M40 gas mask, M40A1, M42, and M42A1, plus the 3M FR-M40 respirators including the FR-M40-10, FR-M40-20, & FR-M40-30.
Nosecup Valve Seat Assembly for M40 Series Gas Masks (Pair)
Our Price: $19.95

New Nosecup Valve Seat Assembly for M40 Series Gas Masks (Pair)

New snap in (no RTV silicone glue necessary) Nosecup Valve Seat Assemblies (pair) hold the silicone rubber nosecup valve disks. The disks then allow filtered air to enter nosecup and prevent moist exhaled air from fogging the eyelens in cold weather.

The nosecup valve seat assembly fits the M40 series gas mask, including the M40 gas mask, M40A1, M42, and M42A1, plus the 3M FR-M40 respirators including the FR-M40-10, FR-M40-20, & FR-M40-30.
Outlet Valve Disk for M40 Series Gas Masks, M17 & Others
Our Price: $14.95

Outlet Valve Disk (OVD) for M40 series gas masks & others including M17
Outlet Valve Disk for M40, M42 and M45 Gas Masks
Our Price: $14.95

Outlet Valve Disk (OVD) for M40 series gas masks & M45 gas masks
Second Skin - Fits M40 Gas Masks
Our Price: $59.95

An EPDM (ethylene propylene diene Monomer [M-class] rubber)/butyl second skin that covers the silicone M40 gas mask facepiece, increasing respirator life and decreasing decontamination costs. New, in package. Gas mask not included.