Bung Caps | McMaster-Carr

	Pipe Size Pipe Size

3/4

	Thread Type Thread Type

NPSM

NPT

Metric

	Material Material

	Drum Plug Type Drum Plug Type

Standard

Pressure Relief

Vacuum Relief

	Color Color

	White
	Gray

	Gender Gender

Male

Female

	Seal Material Seal Material

Rubber

Plastic

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Lock Type Lock Type

Padlockable

Keyed

	Maximum Temperature Maximum Temperature

125° F

350° F

450° F

	System of Measurement System of Measurement

Metric

Inch

	Diameter Diameter

3 1/8"

4 1/2"

5 1/4"

	Height Height

1 3/8"

2 1/4"

	Maximum Opening Pressure Maximum Opening Pressure

4 psi

8 psi

15 psi

	Minimum Opening Pressure Minimum Opening Pressure

	For Pipe Size For Pipe Size

3/4

	For Maximum Shackle Diameter For Maximum Shackle Diameter

5/16"

7/16"

1/2"

	Lock Included Lock Included

Yes

	Drum Vent Type Drum Vent Type

40 Products

Drum Plugs

For installation and removal of these plugs, use drum-plug wrenches.

Plugs with PTFE seals stand up to corrosive chemicals such as nitric acid.

Style D have a M64 thread size, which is also known as Buttress threads.

Drum-plug caps (sold separately) fit over drum plugs to provide dust protection as well as evidence of tampering. They have a breakaway seal and are for one-time use.

Polyethylene Plastic

Drum Plugs												Crimp-On Drum Plug Caps			Crimping Tools for Drum Plug Caps
Style	Drum Plug Type	Color	Seal Material	Pipe/Thread Size	Gender	Max. Temp., °F	Opening Pressure Range	Features	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.		Each
A	Standard	White	__	3/4 NPSM	Male	125°	__	__	5	0000000	00000	10	0000000	000000	0000000	0000000
A	Pressure Relief, Vacuum Relief	White	__	3/4 NPSM	Male	125°	1 psi-4 psi	Vent	5	0000000	00000	10	0000000	00000	0000000	000000
B	Pressure Relief, Vacuum Relief	White	EPDM Rubber	2 NPSM	Male	125°	1 psi-4 psi	Vent	5	0000000	00000	10	0000000	00000	0000000	000000
C	Standard	White	__	2 NPSM	Male	125°	__	3/4 NPSM Faucet Knockout	5	0000000	00000	10	0000000	00000	0000000	000000
D	Standard	White	EPDM Rubber	M64 Metric	Male	125°	__	3/4 NPSM Faucet Knockout	5	0000000	00000	10	0000000	00000	0000000	000000

Polypropylene Plastic

Drum Plugs												Crimp-On Drum Plug Caps			Crimping Tools for Drum Plug Caps
Style	Drum Plug Type	Color	Seal Material	Pipe/Thread Size	Gender	Max. Temp., °F	Opening Pressure Range	Features	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.		Each
A	Standard	Gray	__	3/4 NPSM	Male	125°	__	__	5	0000000	00000	10	0000000	000000	0000000	0000000
A	Pressure Relief, Vacuum Relief	Gray	__	3/4 NPSM	Male	125°	1 psi-4 psi	Vent	5	0000000	00000	10	0000000	00000	0000000	000000
B	Pressure Relief, Vacuum Relief	White	EPDM Rubber	2 NPSM	Male	125°	1 psi-4 psi	Vent	5	0000000	00000	10	0000000	00000	0000000	000000
C	Standard	Gray	__	2 NPSM	Male	125°	__	3/4 NPSM Faucet Knockout	5	0000000	00000	10	0000000	00000	0000000	000000
D	Standard	White	__	M64 Metric	Male	125°	__	3/4 NPSM Faucet Knockout	5	0000000	00000	10	0000000	00000	0000000	000000

Zinc-Plated Steel

Drum Plugs									Snap-On Drum Plug Caps
Style	Drum Plug Type	Seal Material	Pipe Size	Gender	Opening Pressure Range	Features		Each	Pkg. Qty.		Pkg.
E	Standard	Buna-N Rubber	3/4 NPSM	Male	__	__	000000	00000	10	0000000	000000
E	Pressure Relief	Buna-N Rubber	3/4 NPSM	Male	0.5 psi-4 psi	Vent	0000000	0000	10	0000000	00000
E	Vacuum Relief	Buna-N Rubber	3/4 NPSM	Male	0.5 psi-4 psi	Vent	0000000	0000	10	0000000	00000
F	Standard	Buna-N Rubber	2 NPSM	Male	__	__	0000000	0000	10	0000000	00000
G	Pressure Relief	Buna-N Rubber	2 NPSM	Male	13 psi-15 psi	Vent	0000000	00000	10	0000000	00000

316 Stainless Steel

Drum Plugs							Snap-On Drum Plug Caps
Style	Drum Plug Type	Seal Material	Pipe Size	Gender		Each	Pkg. Qty.		Pkg.
H	Standard	Buna-N Rubber	3/4 NPT	Male	0000000	000000	10	0000000	000000
H	Standard	PTFE Plastic	2 NPSM	Male	00000000	00000	10	0000000	00000
H	Standard	PTFE Plastic	3/4 NPSM	Male	00000000	00000	10	0000000	00000
J	Standard	Buna-N Rubber	2 NPT	Male	0000000	00000	10	0000000	00000

Drum Plug Gaskets

Add a gasket or replace one that's worn out to ensure a tight seal.

For 3/4 Pipe Size
Material	Max. Temp., °F	Pkg. Qty.		Pkg.
Polyethylene Plastic	350°	50	0000000	000000
Buna-N Rubber	450°	100	0000000	00000
EPDM Rubber	450°	100	0000000	00000
For 2 Pipe Size
Polyethylene Plastic	350°	50	0000000	00000
Buna-N Rubber	450°	50	0000000	00000
EPDM Rubber	450°	50	0000000	00000

Locking Fill Caps for Drums

Male

Female

Prevent tampering with the contents of your drum while allowing access for filling.

For technical drawings and 3-D models, click on a part number.

Iron
Pipe Size	Gender	Dia.	Ht.	Lock Type	Lock Included	For Max. Shackle Dia.		Each
2 NPT	Male	3 1/8"	2 1/4"	Padlockable	No	7/16"	0000000	000000
2 NPT	Female	3 1/8"	1 3/8"	Padlockable	No	5/16"	0000000	00000
3 NPT	Female	4 1/2"	2"	Padlockable	No	1/2"	0000000	00000
4 NPT	Female	5 1/4"	2 1/4"	Padlockable	No	1/2"	0000000	000000

Drum Vents

Prevent drum failure by using these vents to release pressure and vacuum buildup caused by draining liquids and sudden temperature changes. In case of fire, a flame arrester prevents flashback into the drum.

Style D has a removable cap so it can be used as a fill opening.

	Activation
Style	Pressure Relief	Vacuum Relief	Seal Material	Flame Arrester Material	Pipe Size	Gender	Opening Pressure Range	Specifications Met		Each
For Vertical Drums
Brass
D	Automatic	Automatic	Buna-N Rubber	Brass	2 NPT	Male	3 psi-8 psi	FM Approved	0000000	0000000

Drum Locks

Padlockable locks for closed-head drums replace the plugs on 3/4" and 2" drum openings. Made of brass, they're non-sparking and resist corrosion in wet environments. Slide the bar through the hole in each plug and lock with a padlock (not included).

Keyed locks for closed-head drums fit over standard drum plugs and caps. Use the included keys to secure.

For Closed-Head Drums

Padlockable for Closed-Head Drums

Keyed for Closed-Head Drums

Lock Type	Material	Seal Material	For Pipe Size	Thread Type	Lock Included	For Max. Shackle Dia.	No. of Locks	No. of Keys Included		Each
Padlockable	Brass	Buna-N Rubber	3/4, 2	NPT	No	5/16"	__	__	0000000	0000000
Keyed	Zinc	__	3/4, 2	__	Yes	__	2	2	0000000	00000