Universal NUTLOC™ Fittings


Universal NUTLOC™ Fittings

Universal NUTLOC™ Fittings

Utilize DIG’s Universal NUTLOC™ Drip Fittings to seamlessly link drip tubing or dripline of varying sizes, ranging from 1/2” to 5/8”, encompassing dimensions like .530 ID, .600 ID, and up to .620 ID (equivalent to .630 OD to .710 OD, or 16, 17, and 18 mm). They emerge as a practical solution when facing uncertainties regarding the precise size of drip tubing or dripline, ensuring that a secure connection is established between varying sizes.

Catering to both residential users and professionals alike, the Universal NUTLOC™ Drip Fittings stand as a testament to quality. Crafted from high-impact plastic and fortified with UV protection, these fittings are designed to facilitate seamless connections between an array of drip irrigation tubing and dripline of varying sizes. Employing a meticulously engineered combination of a stepped barb and a threaded nut, these fittings enable the secure joining of two sections of dripline or drip tubing. By gently inserting the drip tubing or dripline into the barbed edges of the fitting and then threading the nuts counterclockwise over the drip tubing or dripline, a remarkably firm and reliable grip is achieved.


  • Made of high-impact, high-strength, UV-resistant plastic for extended operation in harsh conditions
  • Fits .530 ID, .600 ID and .620 ID drip tubing or dripline (equivalent to .630 OD to .710 OD, or 16, 17, and 18 mm)
  • Two-part construction including a threaded nuts and barbed body
  • Threaded nut for easy assembly
  • Available in different configurations including coupling, tee, and elbow
  • Resistant to common fertilizers used in residential and commercial applications


How to Order
.530 ID, .600 ID and .620 ID (.630 OD to .710 OD, or 16, 17, and 18 mm)
DUC 1/2 in. Universal NUTLOC™ Coupling
Connects any two sizes of 1/2" tubing
DUE 1/2 in. Universal NUTLOC™ Elbow
Connects any two sizes of 1/2" tubing
DUT 1/2 in. Universal NUTLOC™ Tee
Connects any three sizes of 1/2" tubing
COUPLING .530 ID, .600 ID and .620 ID
C53-5 Connects any two sizes of 1/2" tubing
1/2 in. Universal Coupling
C53-10 Connects any two sizes of 1/2" tubing
1/2 in. Universal Coupling


  • Operating pressure: up to 60 PSI
  • Color: brown/black
  • Use with 1/2” to 5/8” drip tubing or dripline
  • Material:
    • Body and nut: polypropylene
    • Barb: PBT
  • DIG Universal NUTLOC™ Tee Installation
  • DIG Universal NUTLOC™ Coupling Installation
  • DIG Universal NUTLOC™ Elbow Installation


The Universal NUTLOC™ drip Fittings provide a simple, low-cost method for the installation of dripline and drip tubing. Using the double barbed fittings, dripline or drip tubing is pushed over the barbs for a very tight fit.

The Universal NUTLOC™ drip fittings are made from high-impact plastic material to withstand any installation application. They are available to fit various sizes of drip tubing and dripline from 1/2” to 5/8”, providing a simple solution when connecting two ends of drip irrigation tubing or dripline that are not the same size. The fittings use an assembly configuration that includes a barb, a nut with female thread and a male thread adapter to connect different sizes of drip tubing and dripline. They hold the drip tubing or dripline from the inside with the barb and from the outside with a compression-type threaded nut.

To connect any two sizes of poly drip tubing with .530 ID, .600 ID or .620 ID, use the following steps:

Installation Steps

G77AS-installation-Step1Before attaching the drip tubing or dripline, ensure that the nut is threaded towards the center of the fitting. Once the nut is in position, push the tubing over the barb until it fits snugly.

G77AS-installation-Step2To firmly secure the drip tubing or dripline, thread the nut in a clockwise direction until it is tight.

G77AS-installation-Step3To detach the tubing, turn the nut counterclockwise. Then wiggle the tubing until it slides out of the barb.

Why use DIG’s Universal NUTLOC™ Drip Fittings?

DIG’s drip irrigation Universal NUTLOC™ drip fittings are designed to connect and secure drip irrigation tubing and emitters in place, and they offer several benefits:

  1. Universal compatibility: Universal NUTLOC™ drip fittings work with all standard drip irrigation tubing and emitters, making them a versatile solution for any drip irrigation system..
  2. Easy installation: These fittings can be installed quickly and easily without requiring any special tools or skills. Simply push the tubing into the fitting and hand-tighten the nut to secure it in place.
  3. Strong hold: The nut lock design provides a secure, leak-free connection that is resistant to vibration and movement, ensuring that the system stays in place even in challenging conditions.
  4. Versatility: DIG’s Universal NUTLOC™ fittings are available in a variety of configurations, making them suitable for a wide range of drip irrigation applications, including residential, commercial, and agricultural systems.
  5. Reusability: These fittings can be easily removed and reinstalled, making it easy to modify or expand a drip irrigation system as needed.

In terms of usage, DIG’s Universal NUTLOC™ drip fittings are commonly used in drip irrigation systems to connect tubing and emitters and to create custom configurations. They can be used to connect tubing to a water source or to create branching lines for multiple emitters. They can also be used to create custom lengths of tubing or to connect different types of tubing together.

Overall, Universal NUTLOC™ drip fittings provide a simple, reliable, and versatile solution for connecting and securing drip irrigation tubing and emitters, making them an essential component of any drip irrigation system.