Panther 755000 Flush Buddy — Adjustable Inboard Motor Flusher

Panther 755000 Flush Buddy — Adjustable Inboard Motor Flusher

Flushing your inboard engine after saltwater use or before winter storage is one of the most effective ways to protect your cooling system from corrosion, scale buildup, and freeze damage. The Panther Flush Buddy makes that job straightforward: attach a standard garden hose, position the rubber cup over the water intake on the hull, and extend the adjustable leg to create a seal — no straps, no complicated setup. The engine draws fresh water through its normal cooling circuit, flushing salt, sediment, and debris before you put the boat away.

Built from aluminum and heavy-duty rubber, the Flush Buddy is designed for repeated seasonal use and adjusts to fit a range of hull configurations and intake positions.

Part Identification

• Part Number: 755000 | Store SKU: 781-755000
• Brand: Panther Marine Products
• Official Product Type: Adjustable Inboard Motor Flusher
• Supersedes: No known supersession
• Replaced By: Current production — no known replacement

Compatible Applications

• Inboard engines with hull-mounted water intakes — universal fit
• Suitable for most single and twin inboard configurations
• Works with any engine that draws raw water through a through-hull fitting
• Connects to a standard garden hose (3/4" GHT fitting)

Confirm intake cup diameter and hull clearance before first use. Not designed for outboard or stern-drive flush applications — see dedicated outboard ear-muff style flushers for those engines.

Engine Family & System

• Engine Family: Universal — all inboard raw-water cooled engines
• System: Raw Water Cooling / Engine Flushing
• Diagram Position: Attaches externally at the hull water intake (through-hull fitting). No internal engine access required.

Dimensions & Construction

• Materials: Aluminum body, heavy-duty rubber cup
• Adjustment: Telescoping leg — extends to seal cup against hull at varying intake heights
• Weight: 1,179 g (as listed)
• Hose Connection: Standard garden hose (3/4" GHT)

What's Included

• 1× Panther Flush Buddy adjustable inboard motor flusher
• Rubber intake cup
• Adjustable aluminum leg assembly

Related Parts

• Sea-Dog 521550 Telescoping Inboard Motor Flusher — Alternative Option
• Panther Pro Series 15L Pneumatic/Manual Oil Extractor — For Winterizing Oil Changes
• Panther Pro Series Heavy Duty Manual Fluid Extractor

Service Interval

Use after every saltwater outing and before winter storage. Annual freshwater flushing before lay-up is considered standard practice for all raw-water cooled inboard engines. Inspect the rubber cup for cracking or deformation before each use — replace if the seal is compromised.

Technical FAQ

Q: How do I know if the cup is sealing properly?
A: With the garden hose running and the engine off, water should not bypass the cup around the hull. Once you start the engine, you should see water exiting the exhaust normally. If flow is weak or the engine overheats, reposition the cup and check the seal.

Q: Can I use this on a stern drive (I/O)?
A: This flusher is designed for true inboard engines with a fixed hull water intake. Stern-drive engines (MerCruiser, Volvo Penta I/O) typically flush through the lower unit and are better served by ear-muff style flushers placed over the lower unit water intakes.

Q: How long should I flush the engine?
A: Run the engine at idle for a minimum of 5–10 minutes or until the water exiting the exhaust runs clear. For winterizing, follow your engine manufacturer's specific procedure for antifreeze introduction after flushing.

Q: What hose size does it connect to?
A: Standard 3/4" garden hose thread (GHT) — the same fitting on any residential garden hose.

Parts Desk Insights

Best Use Case: This is the go-to recommendation for inboard owners who want a simple, reusable flushing solution for post-season lay-up or after saltwater use. It's particularly popular with customers who store their boats on trailers and need to run the engine at home without access to water. Pairs well with the Panther fluid extractors for a complete engine service session on the trailer.

Common Issues: Customers occasionally try to use this on stern-drive engines — confirm the customer has a true inboard (not an I/O) before purchase. Cup seal leaks are the most common complaint and are almost always resolved by repositioning and re-extending the telescoping leg for better hull contact. If the rubber cup is worn, advise replacement rather than improvised sealing.