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Products » Marine Sanitation » Holding Tanks » DHT110L Holding Tank System

DHT110L Holding Tank System

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“No Discharge” is no problem with new pre-assembled holding SeaLand tank systems. With five popular tank sizes, boatbuilders can easily outfit any boat in their line with a high-quality holding tank, and assure customers of long-lasting performance and efficiency. 

Available in capacities of 11, 16, 23, 29, and 36 gallons, SeaLand’s five new holding tanks are pre-plumbed with inlet and discharge fittings, a vent fitting, inspection port and pressure relief valve. Each “plug ‘n play”-style tank is pressure-tested and ready to install – just bolt it down, fasten the hoses, and hit the water. 

High-strength polyethylene tanks feature a heavy-duty wall thickness of 0.25-inch to maintain integrity even under high pressure, and to avoid permeation of tank wall with waste odor. Built-in mounting “feet” allow fast, secure bolting to the hull without restraining straps. Top-mounted inlet, discharge and vent fittings rotate to accommodate virtually any plumbing layout. Inlet and discharge fittings accommodate 1.5-inch ID sanitation hose, but can be adapted to other plumbing system dimensions. Also included with each tank are an extra inlet fitting, plug, sealing grommet and hose lubricant for easy hose attachment. 

SeaLand DHT-L series holding tanks are sized to fit on the most popular boat models and lengths.  

      Key Benefits
  • Pre-assembled with all required fittings and ports
  • Five sizes to fit wide range of boat models
  • Heavy-duty polyethylene tank withstands high pressure
  • Tank walls resist waste odor permeation
  • Specially designed discharge fittings are clog-free and minimize tank residual
  • Five-year limited warranty against cracking or leaking  


Model Capacity Empty Weight
DHT42L 42L 5.4kg
DHT61L 61L 7.7kg
DHT88L 88L 10.2kg
DHT110L 110L 14kg
DHT137L 137L 14.5kg





Inlet fitting 1.5 in./38 mm sanitation hose
or PVC pipe
Outlet fittings 1.5 in./38 mm sanitation hose
or PVC pipe
Vent fitting 0.625 in./16 mm ID vent hose
Inspection port 3 in./76 mm FPT


Specifications subject to change without notice 

Materials Tank Polyethylene, 0.25 in./6.3 mm min. thickness
  Fittings PVC, ABS
Colour Tank Natural
  Fittings White
Contents 1x holding tank 1x pressure relief valve | Accessories
  1x inlet fitting 1x inspection port, cap | 1x inlet fitting
  1x vent fitting 2x hose lubricant, tubes | 1x sealing grommet
  2x outlet fittings 1x instruction manual | 1x plug



Model Height (mm) Width (mm) Length (mm)
DHT42L 348 350 460
DHT61L 348 350 660
DHT88L 388 400 800
DHT110L 348 350 1200
DHT137L 388 400 1200

“H” dimension indicates height to top of pre-installed fittings. Specifications subject to change without notice 


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