Cherne® 38" Plate-Style Air-Loc® Head Assembly, 18" - 36"

The Cherne® 38 in. Plate-Style Air-Loc® Head Assembly, 18 in. – 36 in. (part #220388) seals the top of a manhole so the structure can be vacuum tested for leaks. The gasketed 38 in. plate seats on the cone or rim, a vacuum is drawn in the manhole, and the gauge is watched for vacuum loss — a quick, quantitative pass/fail on manhole integrity.

Key Features

• ASTM C1244 vacuum testing — an efficient, accurate, cost-effective method for new, existing, and rehabilitated manholes.
• Covers 18 in. to 36 in. openings — one head assembly handles the common range of manhole access diameters.
• Leak-free gasket seal — the plate's gasket seats firmly on the cone surface for a dependable test seal.
• Lightweight aluminum plate — manageable for a small crew moving structure to structure.
• Remote gauge monitoring — hose-connected gauge keeps personnel clear of the opening while the test runs.

Applications

Used by municipalities, inspectors, and sewer contractors for acceptance testing of new manholes and post-rehabilitation verification — vacuum testing finds leaks at joints, pipe boots, and grade rings in minutes without filling the structure with water.

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.