Amerex Hose Strap and Clip for 330, 331 - 20570, OEM

The Amerex 20570 Hose Strap and Clip is a precision-engineered OEM retention component designed for the high-pressure discharge hardware of Amerex Carbon Dioxide (CO2) extinguishers. Unlike standard dry-chemical units, CO2 models feature a bulky, rigid CO2 discharge horn that requires a specialized docking profile. The 20570 is geometrically tuned for 6.75-inch and 7-inch diameter cylinders, serving as the primary anchor for 10 lb (Model 330) and 15 lb (Model 331) units.

Manufactured from high-impact, UV-stabilized black nylon, this one-piece assembly utilizes a self-locking, permanent-tension head to maintain a non-slip grip. In sensitive environments like server rooms or laboratories, equipment clutter is a major hazard; the 20570 keeps the high-pressure hose and horn assembly immobilized and flush against the cylinder body. This prevents the hose from snagging on rack-mounted servers or delicate lab equipment, ensuring that your primary Class B:C defense tool is always ready for a clean, non-conductive discharge.

The 20570 must only be used on 6.75-inch to 7-inch diameter CO2 cylinders (Amerex Models 330 and 331). It must not be used on standard ABC dry-chemical extinguishers, whose narrower horn profiles are incompatible with the widened CO2 dock of the 20570. Similarly, it must not be used on 20 lb CO2 units (Model 332), which use a larger 8-inch diameter cylinder requiring a longer strap.

Route the hose and horn assembly flush against the cylinder body and thread the strap through the integrated clip. Pull the permanent ratcheting head to tension until the horn is firmly secured without distorting the hose. After the ratcheting head is seated, trim the excess tail with a flush-cut tool; leaving a sharp stub is a laceration hazard during emergency response. Because the 20570 uses a self-locking, permanent-tension head, it cannot be loosened or reset. To perform a mandatory hydrostatic test or internal inspection, the strap must be cut. A fresh 20570 must be installed following service to maintain the extinguisher's UL listing and proper hose retention for the next cycle.

Why does the 20570 look different from standard ABC extinguisher straps?

The horn-dock profile of the 20570 is widened to accommodate the specific diameter of the CO2 discharge horn. Standard ABC clips are too narrow and can pinch or damage the flared end of a CO2 horn. Using the correct 20570 ensures the horn snaps into place with enough tension to survive vibration but releases instantly when pulled for use.

Is the 20570 reusable after a 5-year hydrostatic test?

No. To perform a mandatory hydrostatic test or internal inspection, the strap must be cut to remove the hose. Because it uses a self-locking, permanent-tension head, it cannot be loosened or reset. A fresh 20570 must be installed to maintain the extinguisher's UL listing and ensure the hose remains properly tensioned for the next service cycle.

Can this strap be used on 20 lb CO2 units?

Generally, no. The 20 lb CO2 units (Model 332) typically use a larger 8-inch diameter cylinder. For those units, a longer strap is required to reach around the shell circumference. The 20570 is precision-sized for the 6.75-inch and 7-inch diameter cylinders found on the 10 lb and 15 lb models.