Adopted by most coupler manufacturers, this plug design is considered the industrial standard. It can be identified by the 3/16" pilot and flat bottom V-shaped ball groove.

Conforms to ANSI (NFPA) T3.20.14-1990 dimensions.

1/4" Plugs

 
CP21
NPT
Material
Part Number
Packaging
1/4"
Steel
CP21
Bulk
1/4"
Steel
CP21-100
Bulk
1/4"
Steel
12-225
Carded
1/4"
Steel
12-225-2
Carded
1/4"
Brass
CP21B
Bulk
1/4"
Brass
CP21B-100
Bulk
3/8"
Steel
CP21-03
Bulk
3/8"
Steel
12-227
Carded
CP20
NPT
Material
Part Number
Pack
1/4"
Steel
CP20
Bulk
1/4"
Steel
CP20-100
Bulk
1/4"
Steel
12-235
Carded
1/4"
Steel
12-235-2
Carded
1/4"
Brass
CP20B
Bulk
1/4"
Brass
CP20B-100
Bulk
3/8"
Steel
CP20-23
Bulk
3/8"
Steel
12-237
Carded
.307-32"
Steel
CP22
Bulk
CP21-42
NPT
Material
Part Number
Packaging
1/4"
Steel
CP21-42
Bulk
1/4"
Steel
CP21-42-100
Bulk
3/8"
Steel
CP21-44
Bulk
3/8"
Steel
CP21-44-100
Bulk
CP21-42L
NPT
Material
Part Number
Packaging
1/4"
Steel
CP21-42L
Bulk
3/8"
Steel
CP21-44L
Bulk

1/4" Couplers

 
C21
NPT
Material
Part Number
Packaging
1/4"
Steel
C21
Bulk
1/4"
Steel
C21-100
Bulk
1/4"
Brass
C21B
Bulk
1/4"
Brass
C21B-100
Bulk
1/4"
Brass
13-225
Carded
3/8"
Steel
C21-03
Bulk
3/8"
Brass
C21-03B
Bulk
3/8"
Steel
13-227
Carded
3/8"
Brass
C21-03B-100
Bulk
C20
NPT
Material
Part Number
Packaging
1/4"
Steel
C20
Bulk
1/4"
Steel
C20-100
Bulk
1/4"
Brass
C20B
Bulk
1/4"
Brass
C20B-100
Bulk
1/4"
Brass
13-235
Carded
3/8"
Steel
C20-23
Bulk
3/8"
Steel
C20-23-100
Bulk
3/8"
Brass
C20-23B
Bulk
3/8"
Steel
13-237
Carded
C20-42
NPT
Material
Part Number
Packaging
1/4"
Steel
C20-42
Bulk
1/4"
Steel
C20-42-100
Bulk
1/4"
Brass
C20-42B
Bulk
3/8"
Steel
C20-44
Bulk
3/8"
Steel
C20-44-100
Bulk
3/8"
Brass
C20-44B
Bulk
C20-42L
NPT
Material
Part Number
Pack
1/4"
Steel
C20-42L
Bulk
1/4"
Brass
C20-42LBP-100
Bulk
3/8"
Steel
C20-44L
Bulk
3/8"
Brass
C20-44LBP-100
Bulk

3/8" Plugs

 
12-523
NPT
Material
Part Number
Packaging
1/4"
Steel
12-523
Carded
1/4"
Steel
CP25-02
Bulk
1/4"
Steel
CP25-02-100
Bulk
3/8"
Steel
CP25
Bulk
3/8"
Steel
CP25-50
Bulk
3/8"
Steel
12-527
Carded
1/2"
Steel
CP25-04
Bulk
CP26-22
NPT
Material
Part Number
Packaging
1/4"
Steel
CP26-22
Bulk
3/8"
Steel
CP26
Bulk
3/8"
Steel
12-537
Carded
1/2"
Steel
CP26-24
Bulk
CP25-44
NPT
Material
Part Number
Packaging
3/8"
Steel
CP25-44
Bulk
1/2"
Steel
CP25-45
Bulk
CP25-44L
NPT
Material
Part Number
Packaging
3/8"
Steel
CP25-44L
Bulk

3/8" Couplers

 
C25-02
NPT
Material
Part Number
Packaging
1/4"
Steel
C25-02
Bulk
3/8"
Steel
C25
Bulk
3/8"
Steel
C25-50
Bulk
3/8"
Steel
13-527
Carded
C26-22
NPT
Material
Part Number
Packaging
1/4"
Steel
C26-22
Bulk
3/8"
Steel
C26
Bulk
3/8"
Steel
C26-50
Bulk
3/8"
Steel
13-537
Carded
1/2"
Steel
C26-24
Bulk
C26-44
NPT
Material
Part Number
Packaging
3/8"
Steel
C26-44
Bulk
1/2"
Steel
C26-45
Bulk
C26-44L
NPT
Material
Part Number
Packaging
3/8"
Steel
C26-44L
Bulk

1/2" Plugs

1/2" Couplers

Fits both I/M and T Design Plugs
12-225.png
NPT
Material
Part Number
Packaging
3/8"
Steel
CP17-03
Bulk
1/2"
Steel
CP17
Bulk
12-235.png
NPT
Material
Part Number
Packaging
3/8"
Steel
CP18-23
Bulk
1/2"
Steel
CP18
Bulk
CP21-42.png
NPT
Material
Part Number
Packaging
1/2"
Steel
CP17-45
Bulk
C9-03
NPT
Material
Part Number
Packaging
3/8"
Steel
C9-03
Bulk
1/2"
Steel
C9
Bulk
1/2"
Steel
C9-50
Bulk
1/2"
Steel
13-705
Carded
C10-23
NPT
Material
Part Number
Packaging
3/8"
Steel
C10-23
Bulk
1/2"
Steel
C10
Bulk
1/2"
Steel
C10-50
Bulk
1/2"
Steel
13-713
Carded
13-235.png
NPT
Material
Part Number
Packaging
1/2"
Steel
C10-45
Bulk