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Water Block - 3/8" Water Supply Line Kit

Water Block - 3/8" Water Supply Line Kit

Regular price $30.97
Regular price Sale price $30.97
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Shipping calculated at checkout.


Protect your home from water damage caused by leaks and floods with the Water Block Water Shutoff Kit. This automatic mechanical device adapts directly to 3/8" connections and 3/8" water supply lines, and comes with two brass fittings for easy installation.
The water block works by detecting a preset, continuous flow volume of water. If this threshold is exceeded, the water block will automatically shut off the water supply to prevent major floods. There are 10 potential shutoff settings for up to 13 gallons, so you can adjust the sensitivity of the water block to your specific needs.
The Water Block Water Shutoff Kit is a great way to protect your home from water damage, especially for applications such as faucets, ice makers, refrigerators, toilets, water fountains, water coolers, and sprinkler systems. It is easy to install and does not require any batteries or electricity to operate. It is also very affordable, making it a great value for your money.
The Water Block Water Shutoff Kit can help to protect your home from water damage caused by a variety of failure points, including burst lines, stuck valves, crimps, bad connections, and running water situations.
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General Information

  • Automatically shuts off the water supply to your application to prevent leaks and floods
  • Detects and stops supply line leaks, crimp leaks, bad connections, stuck valves, and running water situations
  • Easy to install directly downstream of the water supply shutoff valve or supply line
  • 3/8" brass fittings included in kit
  • Automatic, 100% mechanical, no batteries or power required
  • Shutoff valve activates when a preset, continuous leak volume is reached
  • Automatically reactivates itself if a predetermined level is not attained
  • 10 activation volume settings in increments of 1.3 gallons (1.3 - 13.0 gallons)
  • Set device for gallon setting slightly above the appliance or applications maximum water consumption volume
  • Water Block only stops water leaks downstream of the device
  • Easy DIY installation
  • Internal release pin or convenience tool option for manual reset (only necessary upon activation)
  • Convenience tool provided for manual reset (only necessary if activation occurs)
  • Configuration options to connect directly to a supply hose or supply line/pipe
  • Learn More Here

Manufacturer Brochure Here


  • Refrigerators
  • Toilets
  • Sinks
  • Coffee Brewers
  • Ice Machines
  • Water Fountains
  • Water Coolers
  • Vending Machines
  • Beverage Machines
  • Irrigation Systems
  • Sprinklers
  • Mist Maker
  • 3/8" Diameter Water Lines
  • Water Appliance Systems

Product Specifications

Technical Specifications:

  • Configuration Overall Length: 5.5 - 8.0 in.
  • Water Block: 3/4 in. Garden Hose Thread Female Inlet Connection
  • Water Block: 3/4 in. Garden Hose Thread Male Outlet Connection
  • Brass Fitting: 3/8 in. Male to 3/4 in. Male Inlet Connection
  • Brass Fitting: 3/4 in. Female to 3/8 in. Male Inlet Connection
  • Brass Fitting: 3/4 in. Female to 3/8 in. Female John Guest Quick Connection

Operation Design Conditions:

  • Ambient Temperature: 36°F - 140°F
  • Relative Humidity: 30% - 95%
  • Fluid Temperature: 36°F - 158°F
  • Device Requires A Continuous Flow or A Minimum Leak Rate of 0.50 Gal/Min To Activate

Legal Notice:

  • California Prop 65 Warning - This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

Connection/Fittings Guide

Click here for the adapters and fittings guide for connecting the
device to the plumbing application or appliance.

Shipping Policy

Thank you for visiting and shopping on the Hawkeyed Water Defense website!

Shipment Processing Time

All orders are processed within 1 to 3 business days (excluding weekends and holidays) after receiving your order confirmation email. You will receive another notification when your order has shipped. 

If we are experiencing a high volume of orders, shipments may be delayed by a few days. If your shipment experiences a significant delay, we will contact you via email. 

Delays in shipments can also occur due to external postal service circumstances that are outside our control. These delays can result from weather events, busy shipping periods, or other unforeseen circumstances. International shipments may experience delays due to the Customs clearance process.

Domestic Shipping Rates and Delivery Estimates

Shipping charges for your order will be calculated and displayed at checkout. This charge will depend on the carrier, destination, speed of delivery, and the size of the order.

Shipping Carrier Options

Estimated Delivery Time

UPS Next Day Air

Next Business Day

UPS Ground

1 to 5 Business Days

UPS Ground Saver

2 to 7 Business Days

UPS Standard

1 to 5 Business Days

USPS Ground Advantage

2 to 5 Business Days

USPS Priority Mail

1 to 3 Business Days

 *These delivery times are estimated and may be longer based on the destination.

Overnight delivery is only available for orders with delivery addresses within the continental United States and shipped through UPS Next Day Air.

International Shipping Rates and Delivery Estimates

We offer international shipping to the following countries:

Anguilla, Antigua & Barbuda, Aruba, Bahamas, Barbados, Belize, Bermuda, Canada, Caribbean Netherlands, Cayman Islands, Costa Rica, Curaçao, Dominica, Dominican Republic, El Salvador, Greenland, Grenada, Guadeloupe, Guatemala, Haiti, Honduras, Jamaica, Martinique, Mexico, Montserrat, Nicaragua, Panama, St. Barthélemy, St. Kitts & Nevis, St. Lucia, St. Martin, St. Pierre & Miquelon, Sint Maarten, St. Vincent & Grenadines, Trinidad & Tobago, Turks & Caicos Islands, and the British Virgin Islands.


Shipping charges for your order will be calculated and displayed at checkout. This charge will depend on the carrier, destination, speed of delivery, and the size of the order.

Shipping Carrier Options

Estimated Delivery Time

UPS Worldwide Expedited

1 to 6 Business Days

UPS Worldwide Saver

1 to 10 Business Days

UPS Standard 

*Canada & Mexico Only

2 to 14 Business Days

USPS First Class Package International

*Canada & Mexico Only

6 to 14 Business Days

USPS Priority Mail Express International

3 to 7 Business Days

USPS Priority Mail International

 6 to 14 Business Days

DHL Express Worldwide

 1 to 14 Business Days

 *These delivery times are estimated and may be longer based on the destination and the Customs clearance speed.

Your order may be subject to import duties and taxes (including VAT), which are incurred once a shipment reaches your destination country. Hawkeyed Water Defense is not responsible for these charges if they are applied and are your responsibility as the customer.

How Do I Check The Status of My Order?

When your order has shipped, you will receive an email notification from us which will include a tracking number you can use to check its status. Please allow 48 hours for the tracking information to become available.

If you haven’t received your order within 14 days of receiving your shipping confirmation email, please contact us at with your name and order number, and we will look into it for you.

Shipping to P.O. boxes

Shipping to a P.O. box is available solely for shipments within the United States via USPS.

Incorrect Shipping Addresses and Refused Delivery

We make every attempt to validate the shipping address provided at checkout to ensure it’s recognized as a valid address by the USPS. If we cannot validate the address, we will try to contact the customer to provide an updated address. If we cannot update the address, the order will be canceled and refunded.

Hawkeyed Water Defense will not be held responsible if the customer provides the wrong shipping address and we cannot recover the package.

Hawkeyed Water Defense will not be held responsible if the delivery is refused and if additional costs are incurred. 


While Hawkeyed Water Defense is not liable for any products damaged or lost during shipment, we want to help you resolve any issues with your order. If your order arrives damaged, please refer to your shipping carrier's claim website for specific instructions on filing a claim. It's helpful to retain all packaging materials and damaged goods in case they are needed for the claim process. You can also contact us for assistance or information on relevant documentation required by the carrier. 

Missing or Stolen Shipments

If you haven't received your order within 3 business days of the reported delivery date, please let us know as soon as possible.

Email us at 

We understand the inconvenience of a missing or stolen order, and we're committed to resolving it as quickly as possible. We will file a claim with the shipping carrier to investigate the situation and take appropriate action, which may involve local authorities. When the investigation is complete, we may replace or refund your order. Please allow up to 21 days for the investigation.

Refunds and Returns

Hawkeyed Water Defense Refund and Return policy can be found here.

Contact Information

If you have any further questions, please don't hesitate to contact us at


Disclaimer: Hawkeyed Water Leak Defense is a distributor of plumbing solutions. We are not responsible for any damage that may occur from using or installing our products. By using our products, you agree to release us from any and all liability. If you have any questions or experience an issue, you should contact the manufacturer directly.

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