Butterfly Valve Lockout
Effectively locks out butterfly valves when used with our Adjustable Cable Lockouts
- Item #:
- C3205-S3920
- Compliance:
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- OSHA
Other configurations of this product

Master Lock Part# S3920. Together with our Adjustable Cable Lockout device (sold separately), this Butterfly Valve Lockout device will lock out virtually any butterfly valve. The wedge-shaped device is made of durable, lightweight Zenex™ thermoplastic material, enabling the device to be chemical resistant and perform effectively in tough environments. It also features a stainless steel rivet that allows it to smoothly pivot open and closed to ensure proper fit, and directional arrows molded into the device help minimize errors during installation.
Fits Butterfly Valves of Virtually Any Size
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Material | Sku | Quantity/Price | |||
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Zenex™ Thermoplastic | C3205-S3920 | $21.25 | $20.40 | $19.60 |
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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Butterfly Valve Lockout
Product Image | ![]() |
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SafetySign Part#: | C3205-S3920 | ||
Master Lock Part#: | S3920 | ||
Fits Valve Sizes: | Virtually all butterfly valves | ||
Weight: | 0.10 lbs (45.3g) | ||
Product Dimensions: | Closed position 1.32″ (33.5mm) H |
Open position 1.80″ (45.7mm) H |
Max. handle width 1.72″ (43.7mm) W |
Material: | Body: PBT and PC Thermoplastic / Rivet: Stainless Steel | ||
Temperature Range: | -40° F to 200° F (-40° C to 93° C) | ||
Chemical Resistance: | Resistant to silicone oils, hexane, solvents, bleaches, dilute acetic acid and naphtha | ||
Corrosion Resistance: | ASTM F883-09 Section 11.3, Grade 6 Weathering-Corrosion Test | ||
Product Features: | Locks out valve in seconds by feeding our adjustable cable lockout device through desired eyelet and around valve neck | ||
Durable, lightweight thermoplastic material is chemical resistant and performs effectively in extreme environments | |||
Directional application arrows allow for ease of installation and minimize user error | |||
Stainless steel rivet allows device to smoothly pivot open and closed to ensure proper fit | |||
Lockout Function: | Prevents unauthorized activation of the butterfly valve when used with a cable lockout device | ||
OSHA 1910.147(b) Compliance: | Capable of being locked out. An energy isolating device is capable of being locked out if it has a hasp or other means of attachment to which, or through which, a lock can be affixed, or it has a locking mechanism built into it. Other energy isolating devices are capable of being locked out, if lockout can be achieved without the need to dismantle, rebuild, or replace the energy isolating device or permanently alter its energy control capability. | ||
Application: | ![]() |
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PDF Instructions: | Download Instructions |