1

24 inch I.D. fiberglass manway extension for 36 inch standard
bury depth below grade

• Bolted cover & gaskets included 
• Stainless steel hardware
• Specify bury depth if other than 36 inches   

 2

4 inch I.D. cam-lock inspection hatch for bolted FRP covers

• Cast aluminum with brass closure arms for padlock
• Includes NPT female fitting on cover
• Used to visually check level without removing cover bolts
• May be used for refilling at 50 PSI maximum pressure

3

30 inch I.D. fiberglass manway extension for 36 inch standard bury depth below grade

• Choose either hinged or bolted cover for the same price
• Hinged overlapping "shoe box" style cover conforms to  AWWA potable standadards
• Includes stainless hardware and manway flange gasket
• Hinged cover flanges have holes for a padlock
• Specify bury depth if other than 36 inches 

 4

48 inch I.D. weather tight manway enclosure vault for 36 inch standard bury depth below grade

• Overlapping dust cover with two stainless handles 
• Locking chain set and lock are not included  
• 20 inch ID internal manway recommended for space
• Manway may be centered or offset inside enclosure
• Some field assembly required
• Specify bury depth if other than 36 inches 

5

24 and 30 inch I.D. ring collar for low cost plastic culvert riser pipe

• Plastic corrugated culvert pipe riser not included 
• Cover at grade not included 
• Not considered water tight
• Commonly used on septic and rain collection tanks 
• Field assembly required 

 6

Fiberglass tank ladders with
mounting brackets installed

• Standard OSHA designs
• Stainless steel hardware
• Shipped loose and must be field installed inside tank
• Specify potable water use when appropriate 

7

Locking steel grade box
for manway security

• Custom built to order for each manway size and application 
• Allow 4 weeks for shop fabrication
• Aluminum Treadbrite cover not automobile traffic rated
• Drop handle and flange holes for a padlock
• Shop iron oxide primer finish supplied on steel parts

 8

 20" x 30" polyethylene manway extension for 36 inch standard
bury depth below grade 

• Gray color, UV resistant 
• Overlapping hinged cover with dust seal and padlock hasp
• Easy access with ample knee and shoulder room 
• Tank entry opening 20" ID 
• Upper portion inside diameter 30 inches at hinged cover
• Includes internal safety cover with lanyard inside 

9

20 inch I.D. segmented spool type polyethylene manway extension

• Each flanged segment is 18" tall / face to face
• Stack and bolt as needed
• Each 18" spool section Includes one gasket and stainless steel hardware
• Grey color, UV resistant 
• Can be shipped individually  by UPS

 10

3 inch water level inspection hatch for polyethylene cover

• Cast aluminum with brass closure arms for padlock
• Includes 3 inch bolt-in fitting
• Used to visually check water level without removing cover bolts
• May be used for refilling at 50 PSI maximum pressure
• Padlock not included

11

4- 6- & 8 inch PVC vent head

• Stainless steel insect screen inside
• Slotted external poly guard
• Includes NPT female tank fitting and PVC adapter
• PVC riser pipe by others as needed 

 12

6 inch PVC vent with 2.5 inch NST/F refill swivel and plug 

• Brass NFPA construction
• Refill at 50 PSI maximum pressure
• Includes tank fitting and PVC adapter
• PVC riser pipe by others as needed

13

6 inch PVC vent with locking 4 inch inspection hatch

• Cast aluminum with brass  closure arms for padlock
• Used to visually check water level with a flaslight
• Not to be used for refilling
• PVC riser pipe by others as needed 

 14

High level water control

• Prevents "freeze-off" from overfilling tank
• Diverts excess water into backfill
• Includes check valve
• Includes inner and outer debris filters 
• Includes NPT 2" female tank fitting 

15

4- 6- & 8 inch overflow assembly

• Diverts excess water to remote daylight discharge
• Includes swing check valve and heavy metal rodent guard 
• Includes PVC stub pipe and hump hose rubber flex connector at tank 
• PVC piping run by others 

 16

6 inch NST- Male dry fire hydrant
for suction water supplies

• Aluminum construction with metal cap and  chain lanyard
• Removable strainer plate
• 45, 90, 180 degre PVC head choice, all same price 
• NFPA anti-vortex plate and 6 inch internal draw pipe
• Includes 6 inch female NPT tank fitting and PVC adapter
• PVC riser pipe by others 
• Storz hydrant head available 

17

Siamese refill 2.5" X 2.5" NST
with clappered female swivels

• Brass NFPA construction
• Includes top and bottom adapters for PVC riser pipe
• Includes 4" NPT tank fitting
• Refill at 50 PSI max. pressure
• PVC riser pipe by others 
• Some field assembly required

 18

4 inch through 12 inch
flanged fittings with gussets

• May be installed anywhere on tank heads or shell
• Standard ANSI 150# flat flange face and bolt pattern
• Gasket and bolts by others 
• Available in standard pipe sizes through 12 inch       

19

Anti-vortex blades in bottom suction fittings

• Used on an outlet line feeding a pump or fire hydrant
• Decreases water swirl to improve flow rate when tank nears empty
• Available for flanged or threaded fittings 

 20

NPT tapered fiberglass female pipe thread half couplings 

• May be installed anywhere on  tank heads or shell
• Available in standard pipe sizes through 8 inch 
• Use full couplings when threads are required both inside and outside the tank       

21

4 inch through 16 inch schedule
80 PVC stub pipe bonded
through tank head or shell

• May be installed anywhere on tank heads or shell
• Connection point for piping both inside or outside tank
• Suitable for direct connection with a mechanical joint (MJ) or Dresser style compression fitting 

 22

Rubber flex member for flanged fiberglass fitting applications 

• Mates up with standard 150#  ANSI flange and bolt pattern
• Includes one gasket & stud kit
• Includes poly protective wrap
• Rated at 75 PSI working pressure
• Avilable in standard flange sizes through 12 inch  

23

Stainless flex members with male tapered pipe threads for pressure inlet and pumped discharge

• Heavy clear vinyl jacket or stainless steel braid
• Includes 1 reinforced PVC schedule 80 pipe adapter
• Vinyl jacket version rated at 25 psi 
• Braided jaclet version rated at 75 psi

 24

4- 6- & 8 inch Hump Hose low pressure flex couplers for PVC stub pipe connections

• Rated for 25 psi working pressure
• Fits schedule 40 pipe dia. 
• Connects to tank stub pipe 
• Stainless clamps included
• Often used on wastewater treatment tanks, overflow connections, and rainwater collection lines 
• Not for use as a bottom discharge flex (6:00 position) 

25

Darco brand MaxFlex coupler 
for low pressure applications

• Stainless body with PVC ends
• Commonly use as discharge flex on fire service tanks
• Available with PVC flanges or socket ends  
• Different configurations and PVC adapters are available
• Rated at 25 PSI working pressure  only when buried below grade 
• Price varies with fitting ends and adapters required

 26

Submerged water inlet filter

• Manway mount on brass 1 inch pitless adapter 
• Uses universal filter cartridges
• Includes 1" feed line stainless flex member and PVC adapter
• Includes adjustable bypass pressure relief valve
• Must be field installed
• Installation requires hole saw and grinder work on site

27

Float valve water inlet control

• Manway mount on brass 1 inch pitless adapter 
• Adjustable float arm for proper air space at top of tank 
• Brass piping and backflow check valve
• Includes 1" feed line stainless flex member and PVC pipe adapter
• Must be field assembled
• Installation requires hole saw and grinder work on site

 28

Pump mounting platform bonded to tank floor

• 24" x 24" flat fiberglass surface
• Raised 6" above floor for bolt access below platform
• Rated for 250 pound maximum pump weight 
• Field drill to mount equipment
• Shield tank wall when drilling downward through platform 

29

Water level gauge - mechanically float actuated

• Requires no electric power
• Metal guage body with weather proof clear viewing lens
• Reads to 108 inches maximum  water depth 
• Includes NPT female tank fitting
• Must be field assembled & calibrated by the installer

 30

1 & 2 inch brass pitless adapter

• Female pipe thread connections
• Rated at 75 PSI working pressure
• Includes braided stainless flex member & PVC pipe adapter 
• Often used with submersible pumps or plumbing
• Lift up slider to easily remove equipment for service  
• Installation requires hole saw and grinder work on site  

31

Darco submersible bottom suction pump

• 120 VAC - 1/2 HP - 50 PSI - 20 GPM discharge capacity
• Adjustable pressure relief valve included (set at 75#)
• Assembly mounts on 1 inch pitless adapter in manway
• Lift up to remove pump 
• Includes 1" ss flex member
• Installation requires hole saw and grinder work on site
• Use float tree and level control float switch kit

 32

PVC float tree and level control float switch kit

• Sliding adjustable float position design
• Includes 2 mounts with stainless steel hardware
• Used to control pumping functions - up or down 
• 3 wire, 12 amp (non mercury)SP/DT switch 
• 1" PVC drop pipe by others
• Suitable for potable water 

33

Alarm panel for high level or
low level water volume alert

• 120 VAC power required
• Plastic box mounts on post by tank or inside building 
• Flashing red light and buzzer
• Alarm silence switch on outside surface of panel
• Use with Darco float tree level control float switch kit
• Field assembly required 

 34

Fiberglass "half round" deadman anchor forms

• 12 feet long / may be sawed down for shorter applications
• Reuseable if oiled before pouring concrete
• Follow Darco rebar location details in manual 
• Must be supported with soil before pouring 

35

Anchor strap and cable kits 

• Fiberglass strap with forged steel eyes or hooks at ends
• Includes one Darco strap tensioning tool (per vessel)
• Includes 2 galvanized steel cables and 6 clamps per strap assembly 
  

 36

Bonded 24'' dia. bottom sump 

• One piece - integral with tank
• Suitable for submersible pumps up to 100 pounds
• Allows complete tank volume usage 
• Can incorporate an anti-vortex plate for NFPA suction hydrant compliance
• 24" ID x 12" deep
• Anti-vortex plate not included

37

Bolt-on 24" dia. bottom sump 

• Allows complete tank volume water usage
• Often used for submersible or vertical turbine pumps
• Bolted design with 32" total depth from bottom of tank
• 24" inside diameter with tapered lower section 
  

 38

Questions?

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info@darcoinc.com

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