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Weld Collars & Gaskets – Clamp-Ring Style
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Weld collars are often sold separately from the manhole.  A clamp ring is used to hold the manhole cover to the collar with a gasket seal between.  Material variations are aluminum, steel, 304 stainless steel and 316 stainless steel.  The manholes are offered in various sizes including elliptical 12 x 16″ and round 16″, 20″ and 24″.  Collars must be fixtured during welding to tank to ensure they remain flat and round.

12’x16″ Elliptical Collar
4055AE – Aluminum
4055MS – Steel

16″ Round Collar
3057MS – 16″ Steel
3057AE – 16″ Aluminum
3057AE021 – 16″ Aluminum (w/ holes)
3057SL – 16″ 304 Stainless
3057SS – 16″ 316 SS

20″ Round Collar
3176MS – 20″ Steel
3176MS-8.00 – 20″ Steel (8″ high)
3176AE – 20″ Aluminum
3176AE285 – 20″ Aluminum (w/ holes)
3176SL – 20″ 304 Stainless
3176SS – 20″ 316 SS

24″ Round Collar
4229MS – 24″ Steel
4229SL – 24″ 304 Stainless

12″x16″ Elliptical Gasket

16″ Round Gaskets (“L” shaped)
3559BN – Black Buna-N (Nitrile)
3559VT – Black FKM Type-A
3559WH – White Hypalon
3559WE – White FDA EPDM (Food Grade)

20″ Round Gaskets (“L” shaped)
3560BN – Black Buna-N (Nitrile)
3560VT – Black FKM Type-A
3560WH – White Hypalon
3560WE – White FDA EPDM (Food Grade)

24″ Round Gaskets (“L” shaped)
4230BN – Black Buna-N (Nitrile)