by Stuart Spaulding —
CLIA Certified Landscape Irrigation Auditor Training & Communications Manager at DIG Corp.



  •  1/8” is for use with 12 outlet drip head (Maverick) and spray sticks (#9802-2) only 
  •  ¼” micro-tubing is available in Vinyl or Polyethylene 
  •  ¼” Poly is less bendable than vinyl but withstands high temperatures better than vinyl 
  •  Micro-tubing is primarily used to extend a dripper or micro-sprinkler away from the ½” poly tubing or to branch off to reach plants in containers  Both ¼” vinyl and poly accept ¼” barbed fittings 
  •  Uncoil the tubing and lay it out in direct sunlight or soak the end in a cup of hot tap water to make it easier to insert barbs 



  •  Are categorized into two types- pressure compensating, and non-pressure compensating 
  •  Pressure compensating (PC) drippers are pre-set at a specified flow rate and are non- adjustable 
  •  PC drippers are preferable for drip systems that have significant changes in elevations and/or long run lengths (over 250’). 
  •  PC drippers compensate for differences in pressure throughout the system and can provide better system uniformity 
  •  Non- PC drippers are suitable for most residential drip systems that are under 250 feet in length and are relatively level
  •  PC drippers should not be selected for use with gravity flow or rain barrel systems. 
  •  PC drippers must be operated at pressures between 10 & 45 PSI
  •  Non -PC drippers include flag drippers, button drippers, in-line drippers, adjustable drippers 
  •  Select the drippers flow rate based on the soil type, not the plant type or size 
  •  Use lower flow drippers for denser soils high in clay content 
  •  PC drippers cannot be taken apart for cleaning



  •  Is a type of soaker hose that saturates the soil adjacent to the tubing 
  •  Can be laid on the soil surface and/or covered with mulch 
  •  Available in two diameters, ¼” or ½” 
  •  ¼” is non-PC, ½” is pressure compensating 
  •  Emitters are “built- in” to the tubing wall at pre-set spacings 
  •  Excellent choice for raised vegetable beds, square foot gardening, deep watering of trees 
  •  Determine emitter spacing distance based on soil type-use shorter spacing for sandy, lighter soils 


Micro-sprinklers, Spray Jets, Misters 

  •  Ideal for irrigating flower beds, groundcover, containers and slopes or areas where there are many small plants close together 
  •  Excellent choice for sandy soils 
  •  Are available in a variety of spray patterns and flow rates 
  •  Not recommended to irrigate turf or to install at windy sites 
  •  OK to install on the same zone as drippers 


½” Poly Tubing 

  •  Maximum flow rate = 220 gallons per hour 
  •  Is the primary supply line for residential drip irrigation systems 
  •  Standard DIG ½” poly tubing is .600” ID (inside diameter) .700” OD (outside diameter) 
  •  Connects to .700” compression fittings (color code- black) 
  •  Maximum operating pressure is 60 PSI
  •  Does not need to be buried, & contains UV inhibitors (carbon black) to ensure long-life in direct sunlight 
  •  Maximum single run length = 400 feet 
  •  Also available with .710” OD which connects to .710” compression fittings (color code- blue) 
  •  Uncoil and lay out in direct sunlight to make the tubing more pliable and easier to push into compression fittings 
  •  Never install as a main-line under continuous pressure 
  •  If unsure of your tubing OD, use DIG’s universal Nut Lock fittings 


Hose End Timers 

  •  Simple, do-it-yourself solution to automate a drip system or hose end sprinklers 
  •  Connect to an outdoor faucet with no tools required 
  •  Can be battery powered (BO9D) or light powered (EVO 100-battery free) 
  •  Should never be connected to a PVC or copper mainline 
  •  For outdoor use only 
  •  Install the DIG D52 Y splitter on faucet to use a timer and garden hose on a single faucet 


Head Assembly Components 

  •  Includes the backflow preventer, Y filter, pressure regulator, pressure regulating filter, and swivel adapters 
  •  Can be either “Hose” threads or “Pipe” threads 
  •  Use “hose” thread types (D57A, D46, D45, C34) when connecting to a faucet, hose end timer, or conversion elbow (Q59) 
  •  Use “pipe” thread types (D46P, D55, D54, 50001) when starting from an inline or anti-siphon irrigation valve 
  •  Do not install the pre-set regulators (D46, D46P) on a main line subject to continuous pressure 
  •  Male pipe thread components need to be wrapped with 4-6 layers of Teflon tape to prevent leaks 
  •  Hose thread fittings & components seal against a washer so no Teflon tape is necessary 
  •  Male and female pipe and hose thread fittings and components will appear to screw together but thread damage and leaks will occur if they are connected 


Compression Fittings 

  •  The fittings fit over the outside of the poly tubing 
  •  No glues or tools required to install 
  •  Compression fittings are not designed to be “re-used” 
  •  The poly tubing is “compressed” as it is forced into the compression fitting 
  •  The ends (inserts) are color coded by size 
  •  Blue inserts fit .710” poly tubing 
  •  Black inserts fit .700” poly tubing 
  •  Green inserts fit .620” poly tubing 
  •  Compression fittings are rated up to 60 PSI 


Retrofit Products 

  •  A group of products designed to convert a conventional PVC sprinkler system into a drip irrigation system 
  •  These products have a ½” female thread inlet to screw on to a ½” sprinkler riser 
  •  Install multi-outlet drip heads (A4, AD6 or Maverick 12 outlet) and ¼” microtubing to reach plants that are near the riser 
  •  Install the DSR or Q59 and connect ½” poly tubing to water numerous plants that are not near the ½” riser 
  •  To connect ½” poly tubing to ½” PVC pipe, use the D48 adapter