Cherne ® 4" Single-Size Plumbing Test-Ball ® Plug

The Cherne 4" Single-Size Plumbing Test-Ball (part #270-040) is a pneumatic test plug for DWV testing on 4" sewer and drain pipe — the standard residential sewer line size. Natural rubber inflates to seal pipes from 3.41" to 4.25" ID. Rated for 13 PSI / 30 ft. head pressure at 30 PSI inflation. The most frequently ordered Test-Ball size for residential plumbing code inspections. Replaceable Schrader valve.

Key Features

• Pneumatic inflation — natural rubber expands to seal round and out-of-round pipes
• 13 PSI / 30 ft. head pressure — rated for DWV and plumbing code testing
• Schrader valve (tire-type) — inflate with any standard air source, field-replaceable
• Ring and chain assembly — prevents draw-in during inflation
• Natural rubber construction — excellent expansion memory for reliable sealing

Technical Specifications

Applications

DWV pressure testing for code compliance, residential and commercial plumbing inspections, stack testing, and sewer air tests. The pneumatic design seals quickly and conforms to out-of-round pipe — faster than mechanical plugs for multi-plug test setups. Always follow Cherne inflation guidelines and never exceed rated inflation pressure.

Questions on sizing or bulk pricing? Call (866) 514-3684 or email us — same-day shipping on in-stock items, tax-exempt purchasing for qualified accounts.