21521 - ESAB R-72 Regulator Bonnet Cap Replacement

Genuine ESAB Replacement Cap for R-72 Series Regulators

The ESAB 21521 Regulator Cap is a critical replacement component designed specifically for the R-72 series of industrial gas regulators. As a genuine Original Equipment Manufacturer (OEM) part, this cap is engineered to meet the exact specifications of the R-72 platform, which has a long lineage of reliability in the welding and cutting industry, often associated with the Purox and Linde heritage brands now under the ESAB umbrella. The cap serves a vital structural function, threading onto the regulator body (bonnet) to house the main compression spring and provide the upper reaction point for the pressure adjusting screw.

Constructed from high-quality, durable metal (typically brass or a robust alloy), the 21521 cap is built to withstand the mechanical stresses of daily adjustment and the environmental rigors of industrial jobsites. Precision machining ensures that the threads engage smoothly with the regulator body, preventing cross-threading which can render a regulator useless. The integrity of this cap is paramount for safety; a cracked or compromised cap can lead to the ejection of the adjusting mechanism or failure to regulate pressure accurately. By utilizing this authentic ESAB part, maintenance personnel ensure that the pressure boundary of the device remains intact and compliant with original design safety factors.

This component is essential for MRO (Maintenance, Repair, and Operations) inventories supporting fabrication shops that utilize oxy-fuel cutting and welding equipment. The R-72 series is a workhorse in the industry, and having the correct spare parts like the 21521 cap ensures minimal downtime during equipment servicing. Whether replacing a cap damaged by impact or wear, or performing a comprehensive overhaul of the regulator assembly, this part provides the assurance of fit, form, and function that only an OEM component can deliver.