★★★★★ 4
Good fit
Worked well with no problems.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 24, 2026
Efectiv Nutrition Mass - 5.4kg
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Efectiv Nutrition Mass - 5.4kgSupports Lean Muscle Growth Added Creatine Essential Minerals Great Tasting Efectiv Nutrition Efectiv Mass is a premium quality mass gainer that is packed full of nutrients to assist with your weight gain and muscle building journey. With additional creatine and bet alanine, this product also assits with strength and power for your workouts. This product also contains complex carbohydrate sources, meaning it contains only 1g of sugar per serving.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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Based on 517 reviews
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Product Reviews
★★★★★ 5
Great replacement kit
Called around for quotes to get them replaced and everyone was quoting over $2k just for bellows. Figured I’d give it a try. The rubber is good quality and feels soft. Time will tell but this is an easy job if you’re mechanically inclined. Make sure you replace the plastic water pickup fitting while you’re at it. Found mine to be cracked on disassembly and had to wait for a new one. Should be a easy 3-4 hour job if your not doing the bearing and only doing bellows
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 26, 2024
★★★★★ 3
Just ok
Qualities OK, but for Marine applications might want better
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Reviewed in the United States on August 3, 2025
★★★★★ 5
Great quality
Just as described.
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Reviewed in the United States on July 22, 2025
★★★★★ 5
Bellows kit review initial inspection’s
Very good quality. The hose clamps were event the better ones you have to pay extra in most cases.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 6, 2025
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