The BETRO-LOCK Scupper Plug is a mechanical expanding plug that temporarily seals scupper and deck drain openings on ships, for example during deck cleaning, painting, chemical handling or hydro testing. It is used on cargo vessels, tankers, offshore and supply vessels, and by shipyards and service teams.
How it works
Insert the plug into the opening and turn the T-wrench. The rubber sleeve expands against the inside of the opening and seals it. The top disk is larger than the rubber sleeve and protects against impact from pipe ends. The plug is reusable.
Choose the right size
Measure the inner diameter of the scupper and choose the size range that covers it, from Ø25–37 mm up to Ø550 mm and above. Ordering by IMPA code? See the table below.
Built on the Standard Sealing Plug
The scupper plug is our Standard Sealing Plug. The T-wrench is made of acid-proof steel. Plug numbers 1 to 6 have a through-hole with a 3/8″R internal thread for mounting a pressure gauge to check back pressure. See the Standard Sealing Plug
Working where sparks are a risk?
A version made of non-sparking materials is available. See the Standard Non-Sparkling Plug
Quality since 1979. Made in Norway.
Send us the opening diameter and quantity using the form, and we will reply with the right size and price.
Discover real stories and testimonials from customers who trust BETRO-LOCK for their sealing solutions.

I've installed BETRO-LOCK on several ships and have been impressed by their resistance to corrosion and ease of use. Quality at a reasonable price.

We recommend BETRO-LOCK to all our clients for maintenance works. Their ability to adjust and tighten precisely where needed makes them ideal for both old and new vessels.

We used an adapted plug for ROV to seal pipes on the seabed in connection with cleaning. The plug fit perfectly. It stayed longer than planned, but with the quality and strength of these plugs it was no problem.