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Brass 3/8-in Compression Cap Fitting

Ratings & Reviews for ProLine Series Brass 3/8-in Compression Cap Fitting

4.6
252
Review
 4.6 out of 5
253 Reviews


94% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The compression cap appears to be a generally useful and effective product for sealing off water lines, valves, and other plumbing fittings. Many customers found it worked as expected to stop leaks and facilitate home renovation projects, though some noted using a small washer or Teflon tape helped create a tighter seal. While a few had issues with the cap not fitting properly or leaking, the majority reported it as a reliable and versatile solution for various plumbing needs.

Customer review summary generated by AI, including incentivized reviews.
253 Customer Reviews

1/4 Cap

Would Recommend

Meets my need

January 16, 2026
From Brass 1_SLASH_4-in Compression Cap Fitting Verified Purchaser
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Works well

Right size it worked

December 30, 2025
Verified Purchaser
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water line cap

Would Recommend

My new refrigerator did not need a water line, so I capped off the water fitting at the wall to prevent water leakage damage. Good quality cap and fit perfectly. At the store they had a display of fittings to help you select the proper size. I cut off the end of the water line on the old fridge and took it to the store to get the cap that fit my wall line. A water leak behind the refrigerator could do extensive structural damage by the time you find it.

December 28, 2025
From Brass 1_SLASH_4-in Compression Cap Fitting Verified Purchaser
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Deal with Tanya if your at the store i was at!

Would Recommend

Product was great just had a hairline crack in the sink. I dealt with Tanya at the store located on RT 73 in Vorhees NJ. She was the absolute best. Thank you Tanya for all your help !!!

November 27, 2025
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Won't Seal

Would Not Recommend

Would not seal on male compression fitting. Either was too deep or needs a gasket in it.

November 24, 2025
From Brass 1_SLASH_4-in Compression Cap Fitting Verified Purchaser
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An employee was very helpful in locating this item

Would Recommend

It was right for the purpose I bought it

November 20, 2025
Verified Purchaser
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Make SURE that you get size that fits flex hose

Would Not Recommend

Did not fit my shut-off valve.

November 18, 2025
From Brass 1_SLASH_4-in Compression Cap Fitting Verified Purchaser
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Stop that leak!

Would Recommend

It for perfect

November 6, 2025
From Brass 1_SLASH_4-in Compression Cap Fitting Verified Purchaser
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The caps are easier to use than to cut the pipes

Would Recommend

To me, it was easier to use these And instead of cutting pipes and using fire to weld another cap on this screw on Are terrific. I would recommend them highly. Thank you.

October 21, 2025
Verified Purchaser
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Handy solution to a plumbing problem

Would Recommend

This was a perfect solution to an old valve in the dishwasher water supply that wouldn't fully shut off.

October 2, 2025
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