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Thompson Fabricating LLC
"Engineered Handrail Systems & Other Fabricated Products for the Water, Wastewater, & Architectural Markets"
Industrial Aluminum Handrail "TUFrail"
Architectural Railing
Access Hatches "TUFhatch"
-Exterior Hatch THG
-Interior Hatch TH
-Heavy Duty Hatch H20
-Watertight Series WT
Ladders "TUFladders"
Grating & Support Systems
Cover Plates
Stop Gates
CAD Drawings

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Watertight Model "WT" Aluminum Access Hatch

Available in the "TH" and "THG" Frame

Watertight Acees Hatch, single typical drawing

Specification For Watertight Series

Floor access doors shall be type "TH-WT" (gutterless) or "THG-WT" (gutter type) (WATERTIGHT, ODORTIGHT and GASTIGHT) as manufactured by Thompson Fabricating, LLC (Birmingham, AL). Door leaf shall be 1/4" aluminum checkered plate reinforced with structural aluminum channels and shall be capable of withstanding a 4'-10" head with minimal deflection. (Calculations will be provided to the engineer upon request.) The following items shall be type 316 stainless steel: slam locks, brackets, hinges and hardware. The door shall have a 316 stainless steel gas spring with integral hold open device which will assist in opening the door and shall lock automatically in the open position. The door shall open a minimum of 90 degrees. The aluminum extruded frame shall have a thickness not less than 1/4" and shall incorporate a neoprene gasket that will reduce air leakage to less than 1 CFM per lineal foot of frame when the interior of the hatch is subjected to a 2 inch water column vacuum. For type "THG" doors the gutter frames shall be provided with a 1 1/2" threaded drain coupling. All fasteners which penetrate into the "Dry" area of the hatch shall be sealed with "O" Ring Seals to prevent incidental water and gas leakage. The portion of the frame which is in contact with the concrete shall receive a protective bituminous coating.

Locking Devices
Slip Resistant Coating

NOTES: Independent Lab Test Reports are available upon request.

SIZES: Type "WT" access hatches are only available in standard single leaf access door sizes.

Standard Sizes

Model Single Leaf
Sizes and Weight
Width Length** Weight
TH-1A    2'-0" 2'-0" 60
TH-2A    2'-6" 2'-6" 81
TH-3A    3'-0" 2'-6" 88
TH-4A    3'-0" 3'-0" 100
Model Single Leaf
Sizes and Weight
Width Length** Weight
THG-1A    2'-0" 2'-0" 60
THG-2A    2'-6" 2'-6" 81
THG-3A    3'-0" 2'-6" 88
THG-4A    3'-0" 3'-0" 100
** Length measured on hinge side
Download Specifications CAD Drawing - Interior Single Leaf CAD Drawing Exterior Single Leaf


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