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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint744,823 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringBaselLasso Technik AG
Lasso Technik AG Logo
Verified· 5 sourcesOwner confirmed
Last updatedSeptember 17, 2026
Summary

About the company

Lasso Technik AG is a Swiss family-owned company based in Basel, founded in 1942. Its core activity includes the development, manufacture and distribution of valves under the Stop Silent® brand. The range is divided into two product lines: The Stop Silent® SL13 check valves protect against backflow of fecal-containing wastewater and serve as a barrier against radon and sewer gases. The Stop Silent® AS backflow valves prevent backflow in drinking water and industrial facilities. Lasso Technik supplies customers at home and abroad and also develops customized solutions.

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Products & services

Industry:Technical Consulting & Engineering
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Lasso Technik AG

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Plumbing & Building Services
Water Supply
✓ Offered2
Backwater protection (Stop Silent SL13)
Backwater protection devices for rainwater and sewage containing faeces; protection against backflow, basement flooding, sewer gases and radon, with fast installation even in oval pipes.
Non-return valves (Stop Silent AS)
Non-return valves for drinking water, industry as well as sandy, pasty and gaseous media; various designs such as AS41, AS54, ASSF, ASEA, ASMK and ASFV.
Expertise

Expert

A
Alain Perrin
Marketing

Trained machinist with commercial training. Since 2005 active in marketing, product management and technical purchasing. Since 2022 I have been Marketing Director at Lasso Technik AG.

Qualifications & certifications
Marketingplander 2005
Maschinenmechaniker1998
Reviews

Aggregated rating

Aggregated rating
4.9
of 5

Aggregated from 19 reviews across all connected sources

Sources
GGoogle4.919
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Common questions

Answers

What are Stop Silent check valves type AS used for?
Stop Silent check valves prevent media from flowing back unintentionally. They are used in drinking water, industrial, and special applications with sandy, paste-like, or gaseous media. They protect systems, processes, and pipelines. The AS-type valves have the largest functional opening on the market.
What does the Stop Silent SL13 backflow prevention protect against?
The Stop Silent SL13 protects against backflow caused by wastewater containing fecal matter from the sewer and thus helps prevent basement floods. It also protects against the intrusion of sewer gases and radon with the quickly retrofitted backflow gate. In this way, it markedly increases safety in buildings.
Can the SL13 also be mounted in oval tubes?
Yes, the backflow protection Stop Silent SL13 is designed for quick installation, even in oval tubes. This simplifies installation under different architectural conditions. This often allows for a more efficient installation.
What check valve designs does Lasso Technik AG offer?
The product range includes various designs such as AS41, AS54, ASSF, ASEA, ASMK and ASFV. Depending on the medium, installation situation and requirements for pressure loss, the appropriate solution can be selected. This simplifies the sizing for different applications.
What advantages does the patented Stop Silent® AS check valve offer?
The patented Stop Silent® AS check valve provides the largest functional opening on the market for high flow rates with low pressure loss. The elastic membrane closes smoothly and quietly, reducing water hammer and protecting lines, pumps and fittings. The design is wear-resistant. The stainless steel cone also serves as a coarse filter. Different membrane materials allow use with drinking water and industrial media. The valve can be installed horizontally or vertically and, depending on the variant, is suitable for operating pressures up to 16 bar.
Press

Media

July 23, 2026Media
Stop Silent – die Rückflussverhinderung
gebaeudetechnik.ch
July 23, 2026Media
Stop Silent – die Rückflussverhinderung:
gebaeudetechnik.ch
June 21, 2026Blog
Temporäre Wasserentnahme ab Hydranten – mit dem Rückflussverhinderer Stop Silent AS41
stopsilent.ch
May 14, 2026Media
Planer Installateur - Gummi als Funktionselement
gebaeudetechnik.ch
May 13, 2026Blog
Hochwasserschutz beim Regenüberlauf Alberti in Davos
stopsilent.ch
Credentials

Certifications & memberships

Suisstec Mitglied
Branchenverband für die Gebäudetechnik
VSA
Verband Schweizer Abwasser- und Gewässerschutzfach
SVGW
Trinkwasserteitifikat
Knowledge

Articles about Lasso Technik AG

1 article
4 min read

How does a Wafer Check Valve save space and costs?

At Lasso Technik AG we do not view the wafer check valve as a niche solution, but as a practical answer to tight installation situations. Especially where space, maintenance access and operational safety converge, the wafer design shows its strengths.

September 17, 2026·Read article
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Contact

Location

Niklaus von Flüe-Strasse 33
4059 Basel
Opening hours
Mon
08:00 - 17:00
Tue
08:00 - 17:00
Wed
08:00 - 17:00
Thu
08:00 - 17:00
Fri
08:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.923.119
Founded
1942 · 84 years
Last commercial register change
December 3, 2021
Employees
1 to 10

Active in 25 of 26 cantons

  • AGAargau
  • AIAppenzell Inner Rhodes
  • ARAppenzell Outer Rhodes
  • BLBasel-Country
  • BEBern
  • FRFribourg
  • GEGeneva
  • GLGlarus
  • GRGrisons
  • JUJura
  • LULucerne
  • NENeuchâtel
  • NWNidwalden
  • OWObwalden
  • SHSchaffhausen
  • SZSchwyz
  • SOSolothurn
  • SGSt. Gallen
  • TGThurgau
  • TITicino
  • URUri
  • VSValais
  • VDVaud
  • ZGZug
  • ZHZurich