- Integrated retaining ring keeps hydraulic dust caps and plugs in place for a secure, reliable fit and easy handling. - Socket Plug Cap: hydraulic quick coupling dust cap for pneumatic tools, designed for use across agriculture, construction, and wood industry applications. - Hydraulic caps 1/4: precise workmanship enables smooth operation and safe tightening of hydraulic caps and plugs, compatible with hydraulic quick release caps. - Hydraulic quick coupling covers: quickly connect to the coupling surface while effectively protecting it from dust, debris and damage. Use scenarios - Protect hydraulic quick couplings on farm equipment and tractors during field operations to prevent contamination. - Shield pneumatic tool connections on construction sites from dust and debris during use and downtime. - Cover quick-release hydraulic fittings on woodworking machinery during maintenance or storage to preserve performance. This description maintains the original product functions and scope, emphasizing utility, compatibility, size (1/4), and performance without adding extraneous details.