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56Y Frame 2-1/2" MBT x 2-1/2" MBT Wet End 310-0140 4.00HP - Bubbles Supply

56Y Frame 2-1/2" MBT x 2-1/2" MBT Wet End 310-0140

Part #: 310-0140

$114.20
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About this wet end

This Waterway 56Y frame wet end delivers reliable performance for spas equipped with 4.0HP main pumps requiring 2-1/2" MBT (male buttress thread) inlet and outlet connections. Engineered for Waterway Viper pump systems, this OEM replacement wet end maintains the precise hydraulic specifications your spa needs for optimal water circulation and filtration.

Built to Waterway's exacting standards, this wet end features durable construction designed to handle high-flow spa applications. At Bubbles Supply, we guarantee an exact fit for your pump assembly and provide same-day shipping to get your spa running fast. Every wet end includes our comprehensive 1-year warranty for complete peace of mind. Before installation, verify your existing pump's frame size and connection measurements to ensure proper fitment with your spa's plumbing configuration.

Exact part number

310-0140

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 2.5 inch MBT wet end
  • 310-0140 pump housing
  • 56Y wet end
  • Waterway Viper wet end

Looking for an older part number? Check our supersession lookup tool

Technical specifications

Horsepower
4.0 HP
Frame size
56Y
Port type
2-1/2" MBT (Male Buttress Thread) inlet and outlet

Plumbing notes

  • Port type: 2-1/2" MBT (Male Buttress Thread) inlet and outlet

Need help measuring? Email hello@bubblessupply.com with a photo of your existing plumbing.

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Cracked or leaking pump housing
  • Water leaking from wet end seal area
  • Low water flow or loss of prime
  • Visible cracks or damage to volute
  • Pump cavitating or running dry

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

  • Confirm your existing pump is a Waterway 56Y frame — check the label on the motor end bell
  • Verify both inlet and outlet connections are 2-1/2" MBT — measure or check existing plumbing fittings before ordering
  • Confirm your pump is rated 4.0HP — mismatching HP ratings between wet end and motor will cause performance issues
  • Inspect the motor shaft seal and impeller before ordering the wet end alone — if the shaft seal is leaking, you may also need seal kit replacement
  • Check whether your existing impeller is reusable or needs replacement — the impeller is typically not included with the wet end

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Medium — Some experience neededTypically 45-90 minutes

What's in the box

  • Wet end housing (volute)
  • Impeller (verify inclusion with product listing)
  • Face plate / diffuser
  • Mounting hardware

If your order is missing any items listed above, contact hello@bubblessupply.com within 48 hours of delivery.

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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