Seachoice Mega-Flow Dripless Thru-Hull Fitting — 316 SS, 5/8" Hose, 1-1/2" Max Hull (50-18591)
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Seachoice Mega-Flow Dripless Thru-Hull Fitting — 316 Stainless Steel, 5/8" Hose
A polished 316 stainless-steel thru-hull fitting engineered for maximum flow and a clean, streak-free hull finish. The Mega-Flow design uses thin-wall construction to maximise the internal bore relative to the hull opening, while a drip collar on the face of the fitting channels water away from the hull surface to prevent the staining and streaking common with standard thru-hulls. A machined inner finish reduces the potential for debris accumulation inside the tube. Includes a watertight gasket. Suited to gray-water discharge applications including cockpit drains, sink outlets, and bilge pump discharges.
Parts Desk Insights
This is the correct fitting when you need a 5/8" hose thru-hull in hulls up to 1-1/2" thick and want a stainless-steel finish that resists corrosion and looks good at the waterline. The drip collar is a practical feature on boats where hull streaking from discharge fittings is a cosmetic concern — particularly on white or light-coloured hulls. The thin-wall Mega-Flow design is well-suited to gray-water applications where flow rate matters, such as cockpit drains and sink outlets. Confirm your hose ID is 5/8" and your hull thickness does not exceed 1-1/2" before ordering. This fitting is available in multiple hose sizes — see the related products below for 3/4", 1", 1-1/8", and 1-1/2" hose variants.
Specifications
- Material: 316 polished stainless steel
- Hose size: 5/8" ID
- Maximum hull thickness: 1-1/2"
- Flange diameter: 1-1/4"
- Features: Drip collar, thin-wall Mega-Flow bore, machined inner finish
- Includes: Watertight gasket
- Ideal applications: Gray-water discharge, cockpit drains, sink outlets, bilge pump discharge
Other Sizes in This Range
- Seachoice Mega-Flow Dripless Thru-Hull Fitting — 316 SS, 3/4" Hose
- Seachoice Mega-Flow Dripless Thru-Hull Fitting — 316 SS, 1" Hose
- Seachoice Mega-Flow Dripless Thru-Hull Fitting — 316 SS, 1-1/8" Hose
- Seachoice Mega-Flow Dripless Thru-Hull Fitting — 316 SS, 1-1/2" Hose
Related Products
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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