Cherne® PROVING RING, 12 IN. 5% Deflection, SDR 35

The Cherne® Proving Ring, 12 in., 5% Deflection, SDR 35 (part #73229) is a precision verification ring for confirming that a 12 in. SDR 35 deflection gauge (mandrel) still meets the 5% deflection specification. A quick pass of the mandrel through the ring proves the gauge hasn't been worn or damaged in the field, keeping your deflection test results defensible.

Key Features

• Gauge verification — validates your 12 in. deflection gauge before and after test runs so results stand up to municipal review
• Matched to SDR 35 at 5% deflection — sized for the common 5% deflection acceptance spec on 12 in. SDR 35 PVC sewer pipe (ASTM D3034)
• Fast field check — simple pass/no-pass confirmation with no measuring instruments needed on site
• Part of the Cherne® deflection testing system — Cherne offers proving rings in standard sizes from 6 in. to 18 in. to match your gauge inventory

Applications

Used by municipal inspectors and sewer contractors to certify deflection gauges ahead of post-installation mandrel (deflection) testing on flexible SDR 35 sewer lines, confirming proper bedding and backfill.

Questions on sizing or bulk pricing? Call (866) 514-3684 or email us — we ship within the USA and welcome tax-exempt purchasing for qualified accounts.