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Mirror Polished Stainless Steel 304/316L Beer Brewing Equipment Round Manhole SS304 Cover Vessel Manhole

304/316L Sanitary Round Manhole Cover (Mirror Polished Tank Manway)

Engineered for secure, hygienic access to storage tanks and fermenters, the Aomite Mirror Polished Sanitary Round Manhole Cover provides operators with a reliable, easy-to-use inspection and maintenance port.

Featuring a robust central handwheel and crossbar design, this outward-opening manway ensures an airtight seal when secured. Manufactured from premium SS304 (1.4301) or SS316L (1.4404) stainless steel, the internal surface is precision-polished to an ultra-smooth Ra 0.4µm - 0.8µm, preventing bacterial adhesion and ensuring complete CIP cleanability. Equipped with food-grade gaskets (Silicone, EPDM, NBR, or FPM) and a brilliant mirror-polished exterior, it perfectly complements high-end brewery, dairy, and beverage equipment. As a direct China manufacturer, we offer customizable collar heights and diameters to meet your specific vessel fabrication needs.

Quantity:
Size:	43575 53575 635*75
Material:	SS304 SS316L
Availability:





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Model:
AMTMH0012
Brand:
AOMITE

Product Description

Technical Specifications

Parameter	Specification
Material Grade	SS304 (1.4301) or SS316L (1.4404) Stainless Steel
Design Type	Round Manhole Cover (Outward Opening with Crossbar)
Internal Surface Finish	Ultra-Smooth Polish (Ra 0.4µm - 0.8µm)
External Surface Finish	Mirror Polished (Matte or Sand-blasting optional)
Gasket Material	Silicone / EPDM / NBR / FPM (Food-Grade Compliant)
Standard Sizes (OD x Collar Height)	Ø435 x 75mm / Ø535 x 75mm / Ø635 x 75mm
Connection to Tank	Welded Neck (Collar welded to tank body)
Primary Application	Dairy vats, Beer fermenters, Beverage storage vessels

What do the dimensions like "435 x 75" mean for a round manhole?

Outer Diameter (e.g., 435mm)
This is the outer diameter of the manhole collar. It dictates the size of the opening you need to cut into your stainless steel tank to accommodate the manway.
Collar/Neck Height (e.g., 75mm)
This is the height of the cylindrical neck that gets welded to the tank. Standard heights are 75mm or 100mm. If your vessel has a thick insulation jacket (like a double-walled fermenter), we can customize this height to be much longer so the cover sits flush with the outer cladding.

Why is an internal surface finish of Ra 0.4µm - 0.8µm critical?

Bacterial Control: In brewing and dairy processing, microscopic scratches on metal can harbor spoilage bacteria. An Ra (Roughness Average) of 0.8µm or lower guarantees the surface is smooth enough to prevent microbes from gripping the steel.
CIP Efficiency: A highly polished interior ensures that CIP (Clean-In-Place) spray balls can easily wash away sticky wort, milk fats, and syrups without manual scrubbing.