Marine Hardware, Generator Exhaust Port, w/ Flap, 316 Stainless Steel

$97.93 to $123.71

$97.93 to $123.71


Marine Hardware, Generator Exhaust Port is built for long service on your boat using 316 stainless steel. The flap to prevent water entry is made from 60 durometer nitrile rubber that withstands oil and chemicals.

  • Full thread length to insure fit in any wall thickness
  • Design for easy installation in boat hulls of varying thicknesses, from 3/8" to 2-1/4" as used in inboard/outboard transoms or sides of hull
  • Fully serviceable from outside the vessel
  • Complete with flapper
  • Manufactured of stainless steel for ultimate corrosion resistance and strength
  • 60 durometer nitrile rubber flap prevents backwash
  • High-grade stainless steel fasteners
  • Investment cast 316 stainless steel


Item #
Hose Diameter
Generator Exhaust Port w/ Flap, 316 Stainless Steel, 2" Hose Diameter
Item #:533047-2"
Hose Diameter: 2"
Generator Exhaust Port w/ Flap, 316 Stainless Steel, 1-5/8" Hose Diameter
Item #:533047-1-5/8"
Hose Diameter: 1-5/8"
Generator Exhaust Port w/ Flap, 316 Stainless Steel, 1-1/2" Hose Diameter
Item #:533047-1-1/2"
Hose Diameter: 1-1/2"
Generator Exhaust Port w/ Flap, 316 Stainless Steel, 3" Hose Diameter
Item #:533047-3"
Hose Diameter: 3"



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Question: What is the diameter of the threaded section, for the thru hull hole?  
Answer: The manufacturer tells me the outer diameter of the threaded part of the exhaust port is 2 3/8".

Question: Could I use this for main engine exhaust also?  I have a flathead V8 set up with dual exhaust that will use 1 5/8" exhaust hoses. 
Answer: Yes you can use this exhaust port for engine exhaust.

Question: I have not cut the holes in the wood transom yet for the exhaust.
Answer: As far as drilling/cutting holes when I have installed thru hulls in the past I found it worked well to remove the backing nut, trace the interior diameter of the nut on the hull where you want the fitting, and then use a hole saw that fits just inside the lines. Better to have the hole a little smaller and file or sand off the excess instead of making too big a hole.



  • Marine Hardware Inc. warrants the products described herein and manufactured by Marine Hardware to be free from defects in material and workmanship for a period of ONE 1 YEAR LIMITED WARRANTY from date of shipment by Marine Hardware, under normal use and service, its sole obligation under warranty being limited to repairing and replacing, as hereinafter provided at its option, any product found to Marine Hardwares satisfaction to be defective upon examination of it, provided that such product shall be returned for inspection, freight prepaid, to Marine Hardwares factory within 90 days after discovery of the defect.
  • Return:

  • Restocking charges may apply up to 25% for all product returned
  • All returns must be recevied within 30 days of receipt of items.
  • Manufacturer defects reported within 30 days of receipt will be supplied a pre-paid label for return shipping upon approval.
  • Please contact Go2marine LFS Marine and Outdoor for Manufacture Defects, Returns and help with Warranties.