Model 83638 replacement test plug for PlumbMaster 1 PEX ProSeries systems. Solid brass construction made to seal 1 inch PEX lines for pressure testing and temporary closures. Key benefits Reliable sealing for pressure testing and maintenance: Designed to close off 1 inch PEX lines quickly so you can test or work on plumbing without fluid loss. Durable material and long service life: Solid brass resists wear and maintains thread integrity over repeated use. Simple installation and removal: Straightforward screwin design allows fast, toolassisted tightening or loosening to save time on the job. Direct fit for compatible systems: Built to match the dimensions and fit of PlumbMaster 1 PEX ProSeries test plug applications so replacement is easy and accurate. Minimizes downtime: Replaces worn or missing test plugs to get systems back to service faster. Important attributes Function: Test plug for sealing and pressure testing PEX lines, and for temporary line closures during or flushing. Compatibility: Replacement for PlumbMaster 1 PEX ProSeries brass test plug model 83638. Size: Designed for 1 inch PEX applications. Material: Solid brass body for strength and corrosion resistance in typical plumbing environments. Performance: Provides a tight, repeatable seal for testing and maintenance tasks; suitable for repeated service operations. Typical use scenarios During installation pressure testing, install the plug to isolate and pressurize a 1 inch PEX run for leakage checks. While repairing a section of piping, use the plug to temporarily close off the line and prevent water intrusion into the work area. When flushing or purging systems, cap unused lines to direct flow and simplify the procedure. Practical, serviceable, and built to fit compatible 1 inch PEX ProSeries test plug applications without modification.