Dosatron Water Hammer Arrestor Kit – 1 1/2 Inch

The Dosatron Water Hammer Arrestor Kit (1 1/2 Inch) is a complete, ready-to-assemble package for stopping water hammer on irrigation and nutrient-dosing lines. The kit bundles a water hammer arrestor with all the fittings needed for a clean, permanent installation — no extra trips to the hardware store. Designed for 1 1/2 inch pipe connections, this kit suits high-flow commercial grows and large-scale hydroponic operations running Dosatron injectors or similar inline dosing equipment.

Dosatron Water Hammer Arrestor Kit – 1 1/2 Inch Specifications

The kit is built around the 1 1/2 inch water hammer arrestor and includes all threaded fittings required for a complete inline installation. Specifications are derived from the manufacturer product listing and the physical kit contents.

Why Choose the Dosatron Water Hammer Arrestor Kit

Water hammer is a pressure surge that occurs when fast-moving water is forced to stop or change direction abruptly — commonly when a solenoid valve snaps shut. In a commercial grow facility, repeated hammer events can stress fittings, crack poly tubing, knock dosing injectors out of calibration, and shorten the life of pumps and valves. Addressing it at the source protects the entire downstream system.

This kit addresses the problem with a purpose-built approach:

• Complete kit, no partial orders: The package ships with every component needed for a working inline installation — arrestor, tee, 4 in nipple, elbow, close nipple, union, and thread seal tape. You assemble and install; no sourcing individual fittings separately.
• Sized for high-flow lines: The 1 1/2 inch connection size is appropriate for main supply lines and large-volume distribution networks where smaller-diameter arrestors would be undersized.
• Dosatron / Dilution Solutions lineage: The kit is designed by the same manufacturer behind the Dosatron line of water-powered nutrient injectors, meaning the fittings and sizing are matched to systems that commonly use those injectors.
• Union fitting included: The union allows the arrestor to be removed for inspection or service without cutting pipe, which is practical in a production environment where downtime matters.
• Thread seal tape included: Small detail, but shipping tape with the kit means you can complete the installation from the box without additional supplies.

Best Uses for the Dosatron Water Hammer Arrestor Kit

This kit is appropriate wherever a 1 1/2 inch supply or distribution line is subject to pressure surges from valve actuation. Common installation scenarios include:

• Commercial hydroponic facilities: Large recirculating or drain-to-waste systems with timed solenoid valves on the main supply line are the primary use case. Each valve close event generates a pressure wave; the arrestor absorbs it before it can travel back to pumps, injectors, or header fittings.
• Dosatron inline injector installations: Dosatron injectors are sensitive to pressure variation. Installing this kit upstream protects the injector body and maintains consistent nutrient dosing ratios over time.
• Greenhouse irrigation mains: Header lines serving multiple zones with independent valve timers are especially susceptible to stacked hammer events when several zones close in quick succession.
• Flood-and-drain or NFT systems with automated timers: Flood tables and NFT channels typically use timed solenoids; the arrestor prevents surge damage to the tray fittings and supply line.
• Upgrade or replacement installations: If an existing system is showing signs of water hammer — rattling pipes, joint leaks, fitting failures — this kit provides a direct-replacement solution sized to the 1 1/2 inch main.

If your supply line uses a finer mesh strainer upstream of the arrestor, see the Dilution Solutions 1 1/2 in filter with 200 mesh screen for a matching pre-filter option. For RO-purified feed water on the same system, the Hydro-Logic Micro 75 GPD reverse osmosis system is a common pairing in nutrient-sensitive grows.

Compatibility

The kit is built around 1 1/2 inch NPT-threaded connections. It is compatible with standard schedule 40 PVC, CPVC, and galvanized steel pipe at 1 1/2 inch. The union fitting in the kit allows integration into existing plumbing runs without full disassembly.

The kit is designed to work with Dosatron water-powered dosing injectors and similar inline proportional injectors operating on 1 1/2 inch lines. The union connection allows the arrestor to be isolated and removed for service while the rest of the line remains in place.

If your grow uses a threaded inline strainer ahead of the injector, the Dilution Solutions 1 1/2 in filter (referenced above) shares the same thread size and plumbing convention, making them straightforward to combine in sequence.

Note: Verify local plumbing codes and system operating pressure range with the manufacturer before installation on potable-water-adjacent systems.

Sources & Further Reading