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Whale Non-Return Inline Valve - Suction or Discharge Line - Nitrile

4.2 4.2 out of 5 stars 127 ratings

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1-inch & 1.5-inch

Purchase options and add-ons

Material other
Brand Whale
Item Dimensions LxWxH 9.25 x 4.53 x 3.15 inches
EU Spare Part Availability Duration 5 Years

About this item

  • Check valve reliably maintains prime in a suction or discharge line
  • Prevents drain back so a line is always ready for pumping
  • For use with pipes of 1 inch and 1 1/2 inch diameters
  • Can be used with manual or electric pumps
  • Durable Nitrile construction for reliable performance
  • Designed to fit in-line

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From the manufacturer

Attwood Banner, boat on water
Attwood, Boat Seating, Padded Boat Seat

What makes Attwood different:

  • A proven marine industry leader for over 100 years.
  • Wide range of products, including general marine accessories, seat & table hardware, and water systems & ventilation.
  • Tested to the highest USCG, ABYC, and CE standards.
  • Quality is our highest priority.

Why Attwood?

Attwood, Boat Seats, Fishing Seats, Fishing, Freshwater

Boat Seats, Attwood, Fishing Seats, Freshwater Fishing, Boat Seats

Boat Seats, Attwood, Fishing Seats, Freshwater Fishing, Jon Boats, Fishing Boats

Safety

Attwood is an avid partner for regulatory compliance. Our products will always meet safety and compliance standards, keeping our customers safe and enjoying their time on the water.

Reliability

We provide leading Boating & Marine products and services that are easy to use. Made of premium materials, our products are extensively tested to provide care free boating under all conditions.

Trusted Supplier

Attwood is a premium supplier of genuine boat replacement parts. The quality we deliver has allowed us to be trusted by boat manufacturers across the United States.

Attwood, Marine, Logo, A

The Attwood Promise

Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing of quality boating/marine products for over 100 years. We provide genuine OEM replacement parts delivering safe and reliable lighting, fuel systems, water systems, seating & pedestals, and general marine accessories that are easy to install and meet regulatory compliance.

Product information

Technical Details

Additional Information

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Whale

Whale Non-Return Inline Valve - Suction or Discharge Line - Nitrile


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Important information

Legal Disclaimer

Warning: Product may contain materials cautioned by California Proposition 65

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Customer reviews

4.2 out of 5 stars
4.2 out of 5
127 global ratings

Customers say

Customers like the quality of the check valve, saying it's well made and effective. However, some customers have reported issues with leakage. Opinions are mixed on performance.

AI-generated from the text of customer reviews

5 customers mention5 positive0 negative

Customers are satisfied with the quality of the valve. They mention that it is well made, has a great check valve, and is a simple but effective one way valve.

"Simple but effective one way valve. Well made" Read more

"...These work well for a few years and then wear out. Quality was very good...." Read more

"...Otherwise the product looked well made, at least on the outside. Both delivery and refund were prompt." Read more

"great check valve but it would have been more cost effective to be able to find a replacement for the nitrile valve inside the assembly...." Read more

7 customers mention4 positive3 negative

Customers are mixed about the performance of the valve. Some mention that it works great for a few weeks, then fails. Others say that it failed within a day as the rubber duckbill valve distorted and would not work.

"Bought this for the bilge on my boat. Worked fine for a few weeks and then water started to slowly drain back through the valve...." Read more

"...It failed within 1 day as the rubber duckbill valve distorted and would no longer seal. I had bought a second valve and installed that...." Read more

"Very good!" Read more

"Not likely to work very well for my application..." Read more

10 customers mention0 positive10 negative

Customers are dissatisfied with the leakage of the check valve. They mention that it started to leak water through the seam in the middle, it would no longer seal, and water started to slowly drain back through the valve. Customers also say that the valve is not water tight and does not completely close off when back flow.

"I installed this on a 1” Polly and it worked but it leaked in the seam in the middle. It was returned to Amazon." Read more

"...Worked fine for a few weeks and then water started to slowly drain back through the valve...." Read more

"Does decent, does not completely close off when back flow, but keeps it from completely draining my tank when power goes out." Read more

"...Took it apart lubed o rings and valve and still leaks down maybe I git a dud but when i get around to fixing it Im going for a metal ball type check..." Read more

Not likely to work very well for my application
2 Stars
Not likely to work very well for my application
I never installed this valve because, as you can see from the picture, the valve isn't closed as it comes from the factory. If there were a lot of head, then the back pressure might be enough to close the valve, and it would certainly slow the return flow, but my boat almost sank because of slow flow on the metal flapper valve this valve was intended to replace. I decided to go with a vented loop for my shower sump. Otherwise the product looked well made, at least on the outside. Both delivery and refund were prompt.
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Top reviews from the United States

Reviewed in the United States on May 9, 2020
Style: 1-inch & 1 1/8-inchVerified Purchase
3 people found this helpful
Report
Reviewed in the United States on May 29, 2021
Style: 1-inch & 1 1/8-inchVerified Purchase
Reviewed in the United States on August 20, 2023
Style: 1-inch & 1 1/8-inchVerified Purchase
Reviewed in the United States on October 20, 2019
Style: 1-inch & 1.5-inchVerified Purchase
Reviewed in the United States on June 3, 2015
Style: 1-inch & 1.5-inchVerified Purchase
Reviewed in the United States on September 27, 2019
Style: 1-inch & 1 1/8-inchVerified Purchase
Reviewed in the United States on January 2, 2022
Style: 1-inch & 1 1/8-inchVerified Purchase
One person found this helpful
Report
Reviewed in the United States on May 20, 2017
Style: 1-inch & 1 1/8-inchVerified Purchase

Top reviews from other countries

Translate all reviews to English
KaotenSchlupf
5.0 out of 5 stars Toller Artikel zum günstigen Preis. Tut vollkommen seinen Dienst.
Reviewed in Germany on August 7, 2022
Style: 1-inch & 1.5-inchVerified Purchase
BNAN
5.0 out of 5 stars WHALE LANDNSEA VALVOLA DI NON RITORNO DA 1"
Reviewed in Italy on June 14, 2018
Style: 1-inch & 1.5-inchVerified Purchase
David R
4.0 out of 5 stars Pump outflow
Reviewed in the United Kingdom on October 13, 2012
Style: 1-inch & 1.5-inchVerified Purchase
4 people found this helpful
Report
Susan Whiterow
5.0 out of 5 stars now no need for priming and not reliant on poor internal valve on pump
Reviewed in the United Kingdom on June 21, 2015
Style: 1-inch & 1.5-inchVerified Purchase
Rikalan
1.0 out of 5 stars Was a cone
Reviewed in the United Kingdom on April 23, 2014
Style: 1-inch & 1.5-inchVerified Purchase
6 people found this helpful
Report