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🚫💨 Seal out the stink, breathe in the fresh!
The HLZC Drain Backflow Preventer is an adjustable silicone one-way valve designed to fit standard 1.5" to 1.75" pipes. It prevents sewer backflow and odors with an automatic shut-off mechanism, made from durable, flexible silicone for long-lasting performance. Easy to install and suitable for multiple household drains, it ensures a fresher, cleaner environment without complicated plumbing.





| ASIN | B0895NFGCN |
| Additional Features | Adjustable |
| Best Sellers Rank | #74,625 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #298 in Kitchen Drains & Strainers |
| Brand | HLZC |
| Brand Name | HLZC |
| Color | Blue |
| Compatible Groove Diameter | 4 centimeters |
| Customer Reviews | 4.0 out of 5 stars 768 Reviews |
| Finish Type | Brushed |
| Finish Types | Brushed |
| Global Trade Identification Number | 06221243457657 |
| Included Components | NO |
| Item Dimensions W x H | 1.77"W x 4.52"H |
| Item Weight | 200 g |
| Manufacturer | HLZC |
| Manufacturer Part Number | 4 |
| Material | Silicone |
| Material Type | Silicone |
| Model Number | 4 |
| Number of Items | 10 |
| Number of Packs | 4 |
| Product Dimensions | 1.77"W x 4.52"H |
| Product Style | Modern |
| Special Feature | Adjustable |
| Unit Count | 4 Count |
J**U
Works great and easy to set up
One of the floor drain near the laundry area was occasionally smelling bad. I used this and the smell is gone. A also like that it doesn’t have any mechanical device which can fail in time. This is cleverly designed. Allows water to go through but blocks odors getting out.
T**E
Worth it!
These things worked like a charm to keep the sewer smell from coming through my shower drain(shower over concrete floor) we could not get the trap to set right so we kept getting the smell until we found these. They last a while didn’t affect water flo or drain speed. Worth the money!
O**Y
Returned item, didn’t work for my application.
I attempted to use this product in a sink drain pipe with an air conditioner condensation line offset . Just didn’t fit well. These might be better suited for drain pipes that don’t have a condensation line offset, but for my application, they just didn’t work well. I may reconsider them for my RV one day to prevent grey water tank smells from entering the camper. These are well made and do provide a tight compression seal.
J**S
Simple
Ok for simple installation
J**O
Wish I found these long ago.
For years I have been plagued by sewer odors, they were coming from by basement drain. Every day or two, I had to pour water in the drain to block the gas, in the summer time it wasn’t as bad as it is when there is less humidity and the dehumidifier is not working much, at least then water is going into the drain and helping. It was so bad, without water in the drain, I could hold my hand over the drain and feel the air coming out. Today I got these and immediately went to the basement, popped one of those in and immediately the odor stopped. I poured water in and it passed through and closed up blocking the gas from coming through. I am ecstatic ! It was always an embarrassment to have someone come to the house and we’d have to offer an apology and an explanation. No more, no worries. I’ve no idea how long these will last, so I’m going to buy more, they are well worth the money.
A**.
Doesn’t stop odors!!!
Looks like a neat thing, but doesn’t stop odors at all. Installed on shower drain (after a flexible tube, before going in pvc pipe) and after running water to test, smelled exactly like before from septic system. Also restricts water flow dramatically, now taking a shower fills the tub about 4 inches! Very disappointed with this product, and I got few…now in trash can…guess cannot return after one month
A**R
Solid
These seem to work well as p-trap inserts. They are solid. Only been using a few weeks, working.
S**Y
Excellent for SHOWER DRAIN SMELL
I am loving it the reason I bought this item for was to stop drain smell in my shower and it definitely does the job … no SMELLS … I been using for about 6 months or more and it’s still effective and water drains from the shower quickly … and I only change it once because I didn’t want to clean it off…Excellent FOR SMELL
E**.
Es muy fácil de instalar y hasta ahora cumple muy bien su función
Se instala muy rápido
A**M
حلوة
ممتازة كجودة
S**H
HLZC Floor Drain Backflow Preventer, Silicone
Fits a standard 2 inch pipe like a shower floor drain it looks like it will work. I am giving this five stars because of how cheap the price is but expect a seven dollar product.
P**I
Facil de usar
se quedó bien y el ollor se pasó!
J**O
Sirvió a la perfección
Me funcionó estupendamente
Trustpilot
2 weeks ago
1 month ago