H3R Performance Extreme Quick Release Bracket (3.0" diameter cylinders) (NB300)



Item Description:



H3R Performance fiberglass-reinforced nylon quick release brackets are designed to meet MIL SPEC 810G as well as to withstand inertia loads in excess of 27G in all directions. Made for extreme duty, they offer an exceptional mounting solution for off road and racing enthusiasts. One year limited warranty.

H3R Performance offers Extreme Duty brackets for mounting to flat surfaces. For roll bar mounts click here.

Part # Description
H3R-NB300 Fits 3" diameter cylinders (fire extinguisher models MX250R/B/C & HG250R/B/C)
H3R-NB425 Fits 4.25" diameter cylinders(fire extinguisher models MX500R/B/C & HG500R/B/C)


DISCLAIMER: Always have a professional mechanic install and/or inspect installation of this product.





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We appreciate your business! To make your shopping experience as simple and easy as possible, please refer to our company policies shown below.


Payment Information:

  • We accept PayPal and all major credit cards using PayPal. 
  • For shipment to a California address, we are required to collect 8% sales tax.

Shipping Information:

  • For international shipments, orders may be subject to additional duties, taxes, charges, fees, and costs associated with the shipment of the item once it has reached its destination. These charges are the buyer's responsibilty.
  • Shipping is available to a PO box and any APO/AA/AE/AP address at an extra charge for this service when available.
  • Most orders will ship within 1-3 business days from the time payment is received and cleared.
  • Shipments are not made on weekends or holidays.
  • Express shipping is available at the buyer's expense. Please contact us for a shipment quote to your location.
  • Some out of stock items are drop shipped from a distribution warehouse or directly from the manufacturer, so tracking information may not be available immediately.
  • Tracking numbers will be updated to as quickly as possible once an order has processed and shipped. Tracking numbers are updated manually, so please allow enough time for your information to be entered after your order has been placed.

Return Information:

  • We at Poly Performance will do everything possible to ensure the customer's satisfaction.
  • If there is any error in the part received, please contact us immediately.
  • Returns will be accepted if the item is unused, uninstalled, in the original packaging and in brand new condition.  Items that are defective may also be returned.  We are not responsible for install mistakes.  Items must be returned within 30 days from the purchase date.
  • All returns must be approved and issued a (Return Authorization) RA # for return.  The RA # must be on the outside of each package with the RA # in a visible area.  Any package without the RA # will be refused.
  • Buyer is responsible for shipping charges on returned items and to insure the package.
  • Returns may be subject to a 20% restocking fee. If any item is returned by choice that originally included free shipping (not a defective or performance claim), there will be a restocking fee deducted from the refund.
  • Once items have been received & inspected per our guidelines, a credit or refund will be issued to the customer.
  • Any cancellation must be approved prior to shipping.  Any item that has already shipped must be returned according to the guidelines stated above.