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The DF-5005-505 Flush Galvanized Waterproof Manhole represents a specialized solution for marine access where deck continuity and corrosion resistance are paramount.
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DF-5005-505
HEE
MANHOLE WATERPROOF FLUSH GALVANIZED
| MODEL NO. | A | B | C | D | E | WT.(lbs) |
| DF-5005-505 | 510 | 730 | 34 | 565 | 365 | 104 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | STEEL ABS GRADE-A |
| 2 | RING | 1 | STEEL ABS GRADE-A |
| 3 | GASKET | 1 | NEOPRENE |
| 4 | BOLT HEXAGON & WASHER | 20+20 | GALVANIZED |
As marine operators increasingly prioritize low-maintenance equipment with extended service life, this manhole combines flush-mount design with heavy-duty galvanized protection to meet these demands . Measuring 30 × 24 inches with a total weight of 210 lbs, the DF-5005-505 provides full-sized personnel access while maintaining a smooth deck surface that minimizes trip hazards and aerodynamic drag. Its hot-dip galvanization process ensures exceptional durability in the harshest saltwater environments.
Featuring a 100μm minimum thickness hot-dip galvanized coating, the manhole assembly achieves superior corrosion resistance exceeding ASTM A123 standards . This coating provides a sacrificial zinc barrier that protects the underlying steel from saltwater corrosion, with a projected service life of 15+ years in marine environments. The galvanized finish also eliminates the need for regular repainting, reducing lifecycle maintenance costs.
The precision-engineered frame sits flush with deck surfaces (maximum 2mm elevation) when closed, creating an uninterrupted walking surface that enhances safety in high-traffic areas . The countersunk bolt heads and smooth transition edges prevent snagging of equipment or footwear, making it ideal for passenger decks and cargo handling zones where unobstructed movement is essential.
A double-lip neoprene gasket combined with a continuous compression flange ensures watertight performance up to 4 psi hydrostatic pressure . The 12-bolt pattern distributes pressure evenly across the entire sealing surface, eliminating potential leak paths. A secondary drainage channel captures any incidental water, directing it away from the interior compartment.
Hot-dip galvanizing creates a metallurgical bond between zinc and steel that is significantly more durable than paint or electroplating, providing complete coverage even in recesses and bolt holes . This process results in 5-10 times longer corrosion protection compared to conventional marine paints in saltwater environments.
The flush design eliminates trip hazards in high-traffic zones, while the smooth galvanized surface resists slipping even when wet . The secure bolted closure prevents accidental opening, ensuring passenger safety during vessel movement.
Yes, the DF-5005-505 is available with adjustable frame extensions to accommodate deck thicknesses ranging from 1/2 inch to 3 inches . Custom flange configurations can also be specified for specialized installation requirements.
The double-lip neoprene gasket compresses against a machined stainless steel seating surface, creating a primary waterproof barrier . The continuous bolt pattern ensures uniform compression around the entire perimeter, while the secondary drainage channel provides redundancy against any potential leakage.
The galvanized surface should be inspected annually for damage, with any minor scratches touched up using zinc-rich paint . The gasket should be replaced every 5-7 years or whenever signs of hardening or cracking appear. Bolts should be torque-checked quarterly to maintain proper compression.
MANHOLE WATERPROOF FLUSH GALVANIZED
| MODEL NO. | A | B | C | D | E | WT.(lbs) |
| DF-5005-505 | 510 | 730 | 34 | 565 | 365 | 104 |
| NO. | Name & Specifications | Qty | Material |
| 1 | COVER | 1 | STEEL ABS GRADE-A |
| 2 | RING | 1 | STEEL ABS GRADE-A |
| 3 | GASKET | 1 | NEOPRENE |
| 4 | BOLT HEXAGON & WASHER | 20+20 | GALVANIZED |
As marine operators increasingly prioritize low-maintenance equipment with extended service life, this manhole combines flush-mount design with heavy-duty galvanized protection to meet these demands . Measuring 30 × 24 inches with a total weight of 210 lbs, the DF-5005-505 provides full-sized personnel access while maintaining a smooth deck surface that minimizes trip hazards and aerodynamic drag. Its hot-dip galvanization process ensures exceptional durability in the harshest saltwater environments.
Featuring a 100μm minimum thickness hot-dip galvanized coating, the manhole assembly achieves superior corrosion resistance exceeding ASTM A123 standards . This coating provides a sacrificial zinc barrier that protects the underlying steel from saltwater corrosion, with a projected service life of 15+ years in marine environments. The galvanized finish also eliminates the need for regular repainting, reducing lifecycle maintenance costs.
The precision-engineered frame sits flush with deck surfaces (maximum 2mm elevation) when closed, creating an uninterrupted walking surface that enhances safety in high-traffic areas . The countersunk bolt heads and smooth transition edges prevent snagging of equipment or footwear, making it ideal for passenger decks and cargo handling zones where unobstructed movement is essential.
A double-lip neoprene gasket combined with a continuous compression flange ensures watertight performance up to 4 psi hydrostatic pressure . The 12-bolt pattern distributes pressure evenly across the entire sealing surface, eliminating potential leak paths. A secondary drainage channel captures any incidental water, directing it away from the interior compartment.
Hot-dip galvanizing creates a metallurgical bond between zinc and steel that is significantly more durable than paint or electroplating, providing complete coverage even in recesses and bolt holes . This process results in 5-10 times longer corrosion protection compared to conventional marine paints in saltwater environments.
The flush design eliminates trip hazards in high-traffic zones, while the smooth galvanized surface resists slipping even when wet . The secure bolted closure prevents accidental opening, ensuring passenger safety during vessel movement.
Yes, the DF-5005-505 is available with adjustable frame extensions to accommodate deck thicknesses ranging from 1/2 inch to 3 inches . Custom flange configurations can also be specified for specialized installation requirements.
The double-lip neoprene gasket compresses against a machined stainless steel seating surface, creating a primary waterproof barrier . The continuous bolt pattern ensures uniform compression around the entire perimeter, while the secondary drainage channel provides redundancy against any potential leakage.
The galvanized surface should be inspected annually for damage, with any minor scratches touched up using zinc-rich paint . The gasket should be replaced every 5-7 years or whenever signs of hardening or cracking appear. Bolts should be torque-checked quarterly to maintain proper compression.
