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Twin-Line Pre-Mix Doorway Foam Unit


Wall mounted, air and electricity powered, twin-line pre-mix foam unit for doorways. Supports up to three twin line nozzle assemblies with a total of 100ft total distance with repeat cycle timers.



  • draws from pre-mixed solution
  • powered by compressed air and electricity
  • repeat cycle timer
  • quick-change pump
  • supports up to 3 twin-line stainless steel nozzle assemblies
  • up to 100 ft. (30.5 m) total distance between control box and nozzle(s) (distance does not need to be evenly distributed)


Twin-Line Pre-Mix Doorway Foam Unit

Operation Manual

Twin-Line Pre-Mix Doorway Foam Unit

power type

compressed air, electricity

chemical pickup type

draws from pre-mixed solution

number of products unit can draw from

one product

suction line length/diameter

8 ft. (2.4 m) hose with 3/8 in. (9.5 mm) inside diameter

flow rate*

2 gal/min (7.6 l/min)

pump seals

Santoprene, Viton, or Kalrez

timer operation type

repeat cycle

coverage area

one nozzle: up to 9×5 ft. (2.7×1.5 m);
two nozzles: up to 8×4 ft. (2.4×1.2 m) at each nozzle;
three nozzles: up to 6×3 ft. (1.8×0.9 m) at each nozzle

fan tip

one nozzle: ST80200;
two nozzles: ST80100;
three nozzles: ST8060-1/2

nozzle type

twin-line stainless steel assembly (GK7T)

number of nozzles

one control box can support up to three nozzle assemblies

distance from nozzles to control box

the combined distance between the control box and the nozzle(s) must equal 100 ft. (30.5 m) or less

tubing/fitting sizes

designed for use with 1/2 in. (12.7 mm) outside diameter tubing between control box and nozzle(s)

*dilution rates and flow rates given are based on chemical with viscosity of water and factory air pressure settings.

compressed air requirements

40-80 psi (3-5 bar) with 5-10 cfm (141-283 l/min)

liquid temperature range

40-100˚F (4.4-37˚C)

electrical requirements

120 VAC at 60 Hz, 2 amps (GFCI protected outlet)

operating voltage

120 VAC

chemical compatibility

Chemical products used with this equipment must be formulated for this type of application and compatible with unit materials and pump seals. For more information on chemical compatibility, consult the manufacturer or SDS for your product or contact our customer service department.

DS5 Santoprene (standard) One (standard)
Viton (V) Two (2)
Kalrez (K) Three (3)


Add option codes to item number as shown. For standard options, no option code is needed. Examples:

  • DS5 (standard unit with Santoprene pump seals and one nozzle)
  • DS5-2 (unit with Santoprene pump seals and two nozzles)
  • DS5V-2 (unit with Viton pump seals and two nozzles)
  • complete foam unit
  • twin-line foam nozzle(s) with spray tip(s)
  • adjustable ball-type nozzle insert to hold spray tip
  • mounting hardware for control box and nozzle(s)
  • clear tubing (50 ft. (15.2 m) of 1/2 in. (12.7 mm) outside diameter tubing per nozzle)
  • tee fittings
  • user manual


Support Videos

How to set the timer (TR120DS-A) for doorway units


How to change a needle valve (NV14Y) for doorway units

DS4-2P, DS4, DS3

How to replace an air regulator (R25) for doorway units

DS3, DS1, DS4, DS4-2P, DS5

How to change the timer (TR120DS-A) for doorway units

DS3, DS1, GK5T, DS4, DS4-2P

How to change a pump - with quick-change pump bracket

How to adjust the wet/dry foam needle valve

Cómo ajustar la válvula de la aguja de la espuma húmeda o seca

How to replace a check valve

How to change an air solenoid valve (ACV1) for doorway units

DS1, DS4, DS4-2P, DS3, DS5

How to add air/water separator to a doorway unit

DS4-2P, DS4, DS3, DS5, DS1


Which pump seal material should I choose?

Pump Seal Material Compatibility

Choose a pump seal material that is compatible with the chemicals you will use. Chemical incompatibility can cause accelerated wear and equipment failure that is not covered by warranty, so it’s important to do your research.

  • Consult the safety data sheet (SDS) for your chemical to learn about the ingredients.
  • Use a chemical compatibility database (like this one: https://www.coleparmer.com/Chemical-Resistance) to look up the ingredients and find material compatibility info.
  • Note that the concentration of chemicals makes a big difference in compatibility. Think about whether the chemical you use will be in a pre-diluted or concentrated form when it is used in the equipment.
  • If you need help, ask your chemical manufacturer. Or, send your SDS to techsupport@foamit.com and we can help.

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