Bobrick 3974-57 AC External Ad...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$104.60
$73.31
Bobrick 3974-57 AC External Adapter (6V)

Bobrick 3974-57 AC External Adapter (6V)

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Model: 3974-57

In Stock (leaves warehouse same day if ordered before 3pm ET)

$104.60
$73.31
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Bobrick 3974-57 AC External Adapter (6V)

AC Adapter Kit is supplied with a CULus, CE, GS listed double insulated AC to DC switching power supply. For use with Bobrick’s B-2974, B-29744, B-3974, B-39747, B-3979, B-72974, B-824, B-828, B-8281

Does not include interchangeable plugs for countries outside the US. Order international AC Adapter Kit, Part No.3974-55

Kit includes:

  • 3974-18 AC to DC Switching Power Supply
  • 3974-19 Expandable 1″ Grommet
  • 3974-20 U.S. AC Adapter Plug

Features

  • Converts the unit from batteries to AC Power.

Product Specs

  • Parts and Accessories: AC External Adapter

Resources

Manufacturer Resources

Product Specs

Product Group:
Washroom/Bath Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Parts and Accessories
Department:
Plumbing
Parts and Accessories Type:
Transformer

Bobrick 3974-57 – Frequently Asked Questions

1) Which Bobrick dispensers does the 3974-57 AC adapter kit work with?
The 3974-57 AC adapter kit is made for Bobrick's B-2974, B-29744, B-3974, B-39747, B-3979, B-72974, B-824, B-828 and B-8281 units. It converts those units from battery power to AC, so if your dispenser is one of those models you can stop swapping batteries on it.
2) What comes in the Bobrick 3974-57 adapter kit, or do I need to buy parts separately?
Three pieces ship in the kit: the 3974-18 AC to DC switching power supply, a 3974-19 expandable 1 inch grommet, and the 3974-20 U.S. AC adapter plug. That is everything on the adapter side. You still supply the AC receptacle or hard-wired source at the wall.
3) Can I use the Bobrick 3974-57 AC adapter on a job outside the United States?
No. The 3974-57 ships with the U.S. plug only and does not include interchangeable plugs for other countries. For international installations order the international AC Adapter Kit, part number 3974-55.
4) Is the Bobrick 3974-57 a transformer or just a cord?
It is a transformer style component, not a simple extension cord. The kit's core piece is an AC to DC switching power supply that steps building AC down to the 6V DC the dispenser electronics run on, which is why it can replace the battery pack entirely.
5) We manage several buildings with battery Bobrick faucets and dispensers. Is there one adapter part number I can standardize on?
For U.S. installations, 3974-57 is the single kit to stock. It covers a wide span of Bobrick electronic units (B-2974, B-29744, B-3974, B-39747, B-3979, B-72974, B-824, B-828, B-8281), so one part number handles most of a mixed fleet. Keep 3974-55 on the list only if you also maintain properties outside the U.S.
6) What is the 1 inch grommet in the Bobrick adapter kit for?
The 3974-19 expandable 1 inch grommet finishes the hole the low voltage cord passes through, so the cable can leave the dispenser or countertop cleanly without a raw edge on the cord. It is included, so you do not need to source a bushing separately.
How fast can I get the Bobrick 3974-57 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Bobrick 3974-57 come with a warranty?
Absolutely. The Bobrick 3974-57 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Bobrick 3974-57?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Bobrick 3974-57 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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