Feel free to reach out to us!
Find quick answers to common questions
Press & drag to view
Product Overview
Stop water intrusion before it destroys your lower unit. This professional-grade combination tester allows you to pull and hold both vacuum and pressure with a single tool.
Engineering & Design
- 2-in-1 Design: Flip the valve to switch between pressure and vacuum testing.
- Universal Fit: Includes custom brass adapters for Yamaha, Suzuki, Tohatsu, Mercury, Johnson, Evinrude and Volvo Penta.
- Quick Disconnects: Brass swivel fittings make installation fast and prevent hose twisting.
- Superior to OEM and aftermarket: 90890-06756, CDI 551-34PV, S-34, V-34.
- The Inner Seal (Pressure Test): The lip faces inward. Its job is to keep the gear oil INSIDE the lower unit. You test this by pumping positive pressure into the gearcase and watching the gauge to see if it holds.
- The Outer Seal (Vacuum Test): The lip faces outward. Its job is to keep lake/ocean water OUTSIDE the lower unit. You test this by pulling a vacuum (negative pressure) and ensuring it holds.
Technical Specifications & Fitment
- Dual Function: Dual-Action (Flip switch for Pressure or Vacuum)
- PSI Gauge: High-visibility, highly accurate dial for slow leak detection
- Connection Type: Brass swivel quick-disconnect
- Universal Adapters: Mercury, Mariner, Johnson, Evinrude, Force, Volvo
- Comparable OEM and aftermarket part numbers: 90890-06756, CDI 551-34PV, S-34, V-34
FAQs
Product & Usage
1. Are WVO Designs products built for professional use?
Yes. Every product is built for continuous duty, marine environments, and the kind of fluid-transfer work that breaks cheaper pumps.
2. Can I use a WVO Designs product for my home project?
Absolutely.
3. Can WVO Designs products be used in marine or outdoor conditions?
Yes. WVO Designs products are tested in real-world marine, biofuel, and industrial conditions — heat, humidity, and long runtimes.
Maintenance & Accessories
1. What maintenance does a WVO Designs product need?
Flush with a compatible fluid after each use and keep seals clean. That's it.
2. Can I buy replacement parts?
Yes. Products are in stock at the collection pages.
3. Do you provide installation guides?
Every product ships with a printed install guide. Digital copies and install videos are linked from each product page.
Warranty & Guarantee
1. Do WVO Designs products come with a warranty?
Every WVO Designs product is backed by our 1-year limited warranty against defects in materials and workmanship.
2. How do I register for warranty coverage?
Keep your order confirmation email — it acts as proof of purchase. You can also register your serial number in your account for faster service.
3. What does the warranty cover?
Defects in materials and workmanship under normal use — no fine print, no games. Wear items (seals, gaskets) are covered by a separate 1-year warranty.
4. What if the product fails?
Call us. We'll get you a replacement or rebuild fast — usually the same week.
Purchasing & Support
1. How fast is shipping and delivery?
Most orders ship same-day from Charleston, SC, with delivery in 2–5 business days anywhere in the continental US.
2. Do you offer bulk or corporate purchasing options?
Yes. WVO Designs offers dealer and fleet pricing — call us at (843) 972-4211 or use the contact form.
3. How can I reach a real technician?
Call (843) 972-4211 Mon–Fri, 8am–3pm EST, or email support@wvodesigns.com. No call centers.
Can’t find your answer?
Recently viewed
Last seen items
