The Cherne 4" Sure-Grip plug (part #271-408) is a tool-free mechanical test plug for water and air testing on 4" Schedule 40 and Schedule 80 pipe — the most common residential drain size. Rated for 13 PSI / 30 ft. head pressure. The natural rubber body presses into the pipe by hand and expands to seal without tools or inflation. Use it as a temporary test plug for code inspections or a permanent cap on unused 4" stub-outs.

Key Features

Tool-free installation — press into pipe by hand, no wing nut or inflation
13 PSI / 30 ft. head pressure — rated for DWV water and air testing
Dual use — temporary test plug or permanent pipe cap
Natural rubber body — expands to seal Schedule 40 and Schedule 80 pipe
No bypass — full pipe blockage for complete isolation

Technical Specifications

Cherne Part Number	271-408
Nominal Pipe Size	4"
Max Back Pressure	13 PSI
Max Head Pressure	30 ft.
Body Material	Natural rubber
Operating Temperature	0°F to 125°F
Pipe Compatibility	Schedule 40 & 80 PVC, ABS, cast iron
Bypass	None (full blockage)
Tools Required	None — hand-press installation

Applications

DWV water and air pressure testing, code compliance inspections, stub-out capping, stack testing, and temporary pipe blocking during construction. The Sure-Grip’s tool-free operation makes it the fastest plug to install and remove during residential and commercial plumbing work.

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.

Cherne® 4" Sure-Grip® Tapón de prueba de agua y aire, 13 PSI