20 inch 6 Hold Down 35 PSI MAWP Model 8555

Betts Industries’ Cam-Latch Manhole offers a high-quality, robust design able to meet the stringent requirements of the transportation and processing industries. Whether it is for railcar or over-the-road, liquid or dry bulk, this manhole fills the requirement.

Manhole Specification

Model 8555 is a 20” full opening cam-latch manhole equipped with a quick opening cast aluminum cover which has a lift handle, two padlock tabs and replaceable nylon wear saddles. Six smooth-operating aluminum latches attached to robust 5/8” swingbolts are secured to the collar utilizing a single lug design. The hold-downs are adjustable to create a positive seal between the cover and collar. The cover incorporates innovative safety latches on each side of the handle. These safety latches will not swing off the cover until the cover is lifted slightly off the collar and residual tank pressure is relieved ensuring a stuck cover will not over-ride the safety mechanism. Manhole meets requirements of 49CFR §178.345-5 and §178.347-3.



Product Details

Part NumberHardwareWeld CollarCover and Cam LeversWeightCollar Height *Gasket **
8555ABF-6Zinc Plated SteelAluminumAluminum41 lb (18.6kg)6" (152 mm)White FDA Nitrile (Buna-N)
8555ACF-6Stainless SteelAluminumAluminum41 lb (18.6kg)6" (152 mm)White FDA Nitrile (Buna-N)
8555SBF-6Zinc Plated SteelSteelAluminum60 lb (27.2kg)6" (152 mm)White FDA Nitrile (Buna-N)
8555SCF-6Stainless SteelSteelAluminum60 lb (27.2kg)6" (152 mm)White FDA Nitrile (Buna-N)
8555CBF-6Zinc Plated Steel304 StainlessAluminum60 lb (27.2kg)6" (152 mm)White FDA Nitrile (Buna-N)
8555CCF-6Stainless Steel304 Stainless Aluminum60 lb (27.2kg)6" (152 mm)White FDA Nitrile (Buna-N)

Technical Specifications
Design Pressure Internal MAWPDesign Pressure External MAWPTest Pressure ***Design Temperature Minimum ***Design Temperature Maximum ***
35 psi (2.4 bar)14.7 psi (1.0 bar)53 psi (3.65 bar)-40° F (-40° C)250° F (121° C)
* Alternate collar height available by designating 4, 8, or 10 as last number of part number. Please contact customer Service for coped collar options.
** Alternate gasket material available. See table below.
*** Tests were conducted and ratings determined using white nitrile gasket.
Note: During welding of the collars to the tank, care should be exercised to insure the collars remain flat and round in order to assure proper performance. If necessary, a welding fixture should be used to prevent distortion.

LetterGasket Material
FWhite FDA Nitrile (Buna-N)
VBlack FKM (Viton©)
BBlack Nitrile (Buna-N)
WWhite Hypalen

Installation & Maintenance

Maintenance Manual


MV CL001 Cam Latch Manhole opening, closing, and adjusting latches