Netafim Woodpecker Pressure Compensating Junior Dripper – 2

The Netafim Woodpecker Pressure Compensating Junior Dripper at 2 GPH is a precision irrigation emitter designed for drip systems where consistent output matters. Each dripper ships in a 250-unit bag and features a CNL check valve to stop low-emitter drainage and anti-siphon design to keep contaminants out of the emitter body. The pressure-compensating mechanism maintains 2 GPH across a wide operating range of 12 to 58 PSI, making it suitable for both flat and sloped growing layouts.

Netafim Woodpecker Junior Dripper – 2 GPH Specifications

Specification	Value
Brand	Netafim
Flow Rate	2 GPH
Color Code	Green (2 GPH variant)
Operating Pressure Range	12–58 PSI
Check Valve Type	CNL (anti-siphon)
Compatible Tubing	Netafim Super Flex UV White PE Tubing (HGC747561)
Package Quantity	250 units per bag
Bag Weight	5 lbs
SKU	21520-001640
Outlet Type	Barbed

Why Choose the Netafim Woodpecker Junior Dripper – 2 GPH

The Woodpecker Junior is a purpose-built irrigation emitter, not a generic drip nozzle. Three design features separate it from standard emitters:

• Pressure compensation across a wide range. The dripper delivers a steady 2 GPH from 12 PSI up to 58 PSI. In systems where line pressure fluctuates — due to elevation changes, long run lengths, or a variable pump — every emitter in the row still outputs the same volume. Plants at the end of a long run receive the same water as plants at the head.
• CNL check valve prevents drainage at shutdown. When the irrigation cycle ends, the CNL check valve closes and stops low-emitter drainage. Low emitters at the bottom of a slope can otherwise siphon water out of supply lines after the pump stops, leading to uneven root-zone saturation and potential anaerobic conditions.
• Anti-siphon design keeps the emitter clean. The anti-siphon feature prevents media, nutrient solution, and particulates from being pulled back into the emitter body when pressure drops. This extends emitter service life and reduces clogging in systems that cycle frequently.
• Barbed outlet connects directly to PE tubing. The barbed outlet is sized for Netafim Super Flex UV White PE Tubing (HGC747561), so the emitter installs without additional adapters or fittings when used within a matching Netafim drip system.
• Bulk pack for commercial-scale planting. The 250-unit bag provides enough emitters for a substantial grow without the cost or logistics of sourcing individual units. At 2 GPH, this variant is a common choice for larger containers or faster-draining media.

Best Uses for the Netafim Woodpecker Junior Dripper – 2 GPH

The 2 GPH flow rate and pressure-compensating design make this dripper well-matched to specific irrigation scenarios in controlled-environment horticulture and outdoor growing:

• Coco coir and perlite media. Faster-draining substrates benefit from the 2 GPH output because frequent, moderate-volume irrigations match the media’s drainage rate without waterlogging root zones. The CNL valve prevents back-drainage between cycles.
• Larger container drip systems. Five-gallon and larger containers benefit from a higher flow rate to wet the full root zone within a cycle. The 2 GPH variant is often preferred over 0.5 or 1 GPH models in containers above three gallons.
• Sloped or multi-level grow rooms. The pressure-compensating design is particularly valuable when drippers sit at different elevations. Gravity-induced pressure differences across a rack or tiered bench do not affect output uniformity.
• Long manifold runs. On drip manifolds with many emitters and significant line length, pressure at the far end of the run drops relative to the inlet. Pressure-compensating emitters compensate for this drop and deliver consistent flow regardless of position on the manifold.
• High-frequency automated irrigation. Systems running multiple short cycles per day rely on accurate, consistent emitter output to track irrigation volumes by plant. The 2 GPH output allows growers to calculate cycle time with confidence.
• Commercial greenhouse and propagation benches. The 250-unit bag quantity suits commercial growers equipping large benches or replacing emitters across an established system in a single purchase.

For precise irrigation monitoring, consider pairing your drip system with a 200-mesh inline filter upstream of the dripper manifold to reduce particulate clogging, and use a calibrated EC meter to verify nutrient delivery is reaching target concentrations at the root zone.

Compatibility

The Netafim Woodpecker Junior Dripper – 2 GPH is designed to work within Netafim’s drip irrigation product family. The barbed outlet is sized to fit Netafim Super Flex UV White PE Tubing (HGC747561) without additional adapters. Use Netafim-compatible stakes, weights, or arrow drip holders to secure emitters in growing media.

The dripper operates across a pressure range of 12 to 58 PSI, which covers most recirculating and run-to-waste drip systems. Confirm that your pump or supply pressure falls within this range. At pressures below 12 PSI the pressure-compensating diaphragm may not engage fully, and output will vary. At pressures above 58 PSI the emitter may not maintain rated flow and could sustain damage over time.

The CNL check valve is a passive mechanical feature and requires no electrical connection or adjustment. It operates automatically at every irrigation cycle start and stop. No additional backflow prevention device is required in the dripper line when CNL emitters are in use, though a line filter with 200-mesh screen upstream is recommended to protect the internal diaphragm from sediment.

This emitter is sold as a 250-unit bag (SKU 21520-001640). It is one variant in the Woodpecker Junior family; other flow rates (0.5 GPH, 1 GPH) use a different color code. The green color identifies this unit as the 2 GPH variant. If your system uses multiple flow rates across different zones, confirm color coding before installation to avoid mixing emitter outputs.

Growers managing water quality may benefit from a reverse osmosis filtration system upstream to reduce mineral buildup and extend emitter service intervals.

Sources & Further Reading