Rotating Gate Valve Lockout
Available for gate valve sizes from 1 inch to 13 inches
- Item #:
- C3400, C3401, C3402, C3403, C3404
- Gate Valve Lockout Reads:
- Danger Do Not Operate. This Lockout Device May Only Be Removed By: Name: Dept: Expected Completion:
- Compliance:
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- OSHA
Other configurations of this product

Master Lock Part# 480, 481, 482, 483, 484. The rotating gate valve lockout is available in 5 different sizes to effectively lock out gate valves from being opened or closed. Sizes range from 1" to 3", 2" to 5", 4" to 6-1/2", 6" to 10", and 8" to 13" in inside diameter. The outward/inward rotation the lockout allows for easier installation, especially in confined spaces, and makes storage easier since each size can be nested into the next larger size, thus saving space in safety tool boxes. There is also a center knockout that can be removed for rising stem gate valves and each gate valve lockout features a safety label warning that can be written on to identify the worker performing the lockout and then erased for the next job. These are made from tough, lightweight dielectric thermoplastic that can withstand chemicals and perform in temperature ranges from -50°F to 350°F. Depending on the size selected, there are 2, 3 or 4 spaces available for padlocks or hasps. This accepts padlocks with a maximum shackle diameter of 5/16".
Danger Do Not Operate. This Lockout Device May Only Be Removed By: Name: Dept: Expected Completion:
For 1″ to 3″ Valve Handle Sizes
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Material | Sku | Quantity/Price | |||
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Zenex™ Thermoplastic | C3400-480 | $14.50 | $13.90 | $13.35 |
For 2″ to 5″ Valve Handle Sizes
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Material | Sku | Quantity/Price | |||
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Zenex™ Thermoplastic | C3401-481 | $20.45 | $19.65 | $18.85 |
For 4″ to 6½″ Valve Handle Sizes
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Material | Sku | Quantity/Price | |||
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Zenex™ Thermoplastic | C3402-482 | $27.25 | $26.15 | $25.10 |
For 6″ to 10″ Valve Handle Sizes
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Material | Sku | Quantity/Price | |||
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Zenex™ Thermoplastic | C3403-483 | $38.50 | $36.95 | $35.45 |
For 8″ to 13″ Valve Handle Sizes
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Material | Sku | Quantity/Price | |||
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Zenex™ Thermoplastic | C3404-484 | $56.50 | $54.25 | $52.10 |
Special Freight Arrangement:
Due to the size of this product, freight shipping will be required. You may contact our customer service team for a quote or you can place your order and a customer service representative will contact you about freight shipping charges.
If you would like to use your own freight carrier, please include your freight carrier account in the special instructions box at the bottom of the checkout page before placing your order. A customer service representative will be in contact with you if there are any questions.
Phone: 800-274-6271
Fax: 800-279-6897
Phone: 800-274-6271
Fax: 800-279-6897
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Master Lock Gate Valve Lockout Application
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SafetySign Part#: | C3400 | C3401 | C3402 | C3403 | C3404 |
Master Lock Part#: | 480 | 481 | 482 | 483 | 484 |
Gate Valve Handle Diameter: | 1″ to 3″ (25 – 76mm) |
2″ to 5″ (51 – 12.7 cm) |
4″ to 6½″ (10.2 – 16.5cm) |
6″ to 10″ (15.2 – 25.4cm) |
8″ to 13″ (20.3 – 33cm) |
Gate Valve Lockout Depth: | 1-1/16″ (30mm) |
1½″ (38mm) |
1⅞″ (48mm) |
2¾″ (70mm) |
3⅜″ (86mm) |
Stem Opening Diameter: | ¾″ (19mm) |
1½″ (38mm) |
2½″ (64mm) |
3½″ (89mm) |
4″ (101mm) |
Number Openings for Locks or Hasps: | 2 | 3 | 4 | 4 | 4 |
Max. Padlock Shackle Diameter: | 5/16″ (7.9mm) | ||||
Material: | Tough, lightweight, dielectric Zenex™ thermoplastic bodies withstand chemicals | ||||
Product Features: | Outward/inward rotation allows for easier installation and storage | ||||
Unique patented rotating design allow for easier installation in confined space applications | |||||
Each size rotates into itself and nests into the next larger size to save space in safety tool boxes | |||||
Center knockout can be removed for rising stem gate valves | |||||
Multiple workers can apply their personal safety padlocks | |||||
Complete with high visibility permanent safety labels | |||||
Lockout Function: | Surrounds the valve operating handle to protect against accidental valve opening | ||||
Application: | ![]() |
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Assembly Instructions: | 1. Select the properly-sized cover for the specific valve handle to be locked out. Note: Cover should be loose enough when applied that it does not bind to the valve handle. | ||||
2. Rotate the lockout cover to completely surround the valve handle. | |||||
3. Secure with Master Lock safety lockout padlock(s) by inserting shackle(s) through the overlapping locking eyelets. | |||||
4. To secure a valve handle which has a rising stem, cut out the circular center section of the lockout cover. | |||||
PDF Instructions: | Download Instructions |