GROCO Backing Block f/2" and 2-1/2" Seacocks - BB-3

Marsoni

M251S

$66.99

Get it in 3 business days with 1 day shipping. Friday, May 29

GROCO Backing Block f/2" and 2-1/2" Seacocks - BB-3GROCO Backing Block f 2" and 2 1 2" Seacocks BB 3 Backing Block for 2" and 2 1 2" Seacocks Features: Each size fits multiple seacock sizes Press threaded brass inserts into the hull side of the backing block into the holes that match the seacock flange Rigid 1 2" thickness provides secure installation but is flexible enough to conform to minor hull curvature Will not swell or absorb moisture Made from an environmentally friendly PVC foam specially

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These feel great and fit well. With most briefs I tend to the trouble either keeping the front in or not having the back cover everything but these do both things and are very soft. They also look great, even on body types not in the promo picture. They are a great set of briefs and have held up so far and I got mine a little around a year ago and wear them often.

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Reviewed in the United States on September 26, 2025

Verified Purchase

garlic brad

Los Angeles, US

★★★★★ 4

Comfortable, but run big

Size: Small, Color: Red/Orange/Yellow/Blue

I'm a small guy and I purchased size small. The underwear are not bad. Great if you're a bigger guy or if you have a really big butt. If you're on the smaller side or skinnier though they'll fit a little loose. My butt is pretty big, but it doesn't fill out the back completely. Very comfortable though and the waist fits fine. Just a big backside. They don't ride up and so far they're durable. No fading in color and the material holds strong after many wears and washes.

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Reviewed in the United States on February 24, 2026

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shaik

Lowell, US

★★★★★ 5

Value. Fabric quality.

Size: Large, Color: Black/Navy/Dark Grey/Red

Better than I expected. Great fabric. Perfect fit. This is the most satisfying buy that I ever did. For this price!

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Reviewed in the United States on February 14, 2026

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