Supply Giant IS-D-1NQU Type C Straight Water Arrestor - Stops Water

In this review the Supply Giant IS-D-1NQU Type C straight water arrestor is judged as a no-nonsense plumbing fix for fast-closing valves and appliance hookups. The bottom line: it is aimed at homeowners and light-commercial technicians who need a compact, lead free device to reduce or eliminate water hammer; the arrestor's construction and compatibility make it a practical choice for dishwashers, washing machines and hose bibs where banging or sudden pressure spikes are a problem. Installation simplicity and NSF-approved, lead free design are the single biggest reasons to consider it.

Key Features

• Lead free construction: The arrestor is made with lead free materials and is NSF approved, which helps meet safety and water quality expectations in many installations.
• 3/4 in male NPT connection: The threaded 3/4 in male NPT connection allows direct fitting to common residential piping and appliance outlets for quick installation.
• Solder and push-fit compatibility: The copper straight design can be soldered to copper fittings and also works with push-fit and press-fit systems for flexible joining methods.
• Compact Type C size: The Type C straight profile is compact enough for tight spaces behind appliances and in crawlspaces where longer arrestors won't fit.
• Mitigates water hammer: It is designed specifically to absorb pressure spikes from fast-closing valves, protecting seams and couplings from hammer-related stress and leaks.

Who It's For

This arrestor is best for homeowners, plumbers, and maintenance techs fitting or upgrading residential connections to dishwashers, washing machines, irrigation hose bibs and other quick-closing valves that commonly cause banging. It suits retrofit jobs where space is limited and a short straight unit with a male NPT thread is needed.

Those needing large-capacity commercial arrestors or specialized industrial dampening should look elsewhere; similarly, if a different thread size or an angled body is required, choose a model matched exactly to that piping layout rather than adapting this straight Type C unit.

Pros & Cons

Pros

• Solid, copper-based build with lead free materials and NSF approval adds confidence for potable water systems.
• Easy installation options: compatible with soldering, push-fit and press-fit systems and provides a standard 3/4 in male NPT connection.
• Effectively reduces water hammer for many residential applications, with multiple users reporting reduced banging and improved system longevity.

Cons

• Some users report mixed noise outcomes, so performance may vary with system layout and pipe volume.
• As a compact Type C straight arrestor, it is not suited to installations that require larger capacity or an angled fitting.

Specifications

Our Verdict

The Supply Giant IS-D-1NQU Type C straight water arrestor is a practical, value-oriented choice for residential and light-commercial plumbing where a compact, lead free device with a 3/4 in male NPT connection is required. It offers flexible installation options and reliable mitigation of water hammer in most home appliance and hose bib scenarios, making it a sensible buy for plumbers and DIYers wanting to protect piping and reduce banging.

Frequently Asked Questions

Will this fit my dishwasher or washing machine?
It fits applications that accept a 3/4 in male NPT connection; confirm your appliance or shutoff fitting uses that thread before purchasing.

Can it be soldered to copper piping?
Yes, the copper straight design can be soldered and is also compatible with push-fit and press-fit systems.

Does it completely eliminate all noise from water hammer?
It reduces or eliminates water hammer in many installations, but results vary by pipe layout and system volume, so some users may still hear residual noise.