Picture says ita 21" in diameter but dimensions say 28", which is it?

The diameter inside of the dome is approximately 21" but the dimension from the outside edge of the flange (that mounts to the floor) to the opposite outside edge of the flange is approximately 28". Hope that makes sense.

Your graphic says 21inches while the product description says 28. My sump pit is 22.5. Which measurement is accurate?

Both. The outer flange is 28", which will cover your sump pit. The cover in the middle (the round disk with the holes) is 21". It should fit perfectly over your pit.

Can it fit 3/4 inch pipe ? Do you have rubber seal for included?

It has no threads so you cannot screw a hose or pipe. It’s strictly to be used as a drain hole.

I have a pit dia is 19inch and dirt floor how do I make a tight seal

If you don't have a concrete surround for your pit, you would have to build one as a first step. Simply excavate some of the dirt around the pit, build forms to create a floor area larger than the cover, and pour some concrete to create a flat floor area around the pit.

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JACKEL - Original Radon Sump Dome (Model: SMR16101-CV)

JACKEL - Original Radon Sump Dome (Model: SMR16101-CV)

Product ID: 85873978

Details

Brand
Jackel
Color
Black
Global Trade Identification Number
Item Weight
10.8 pounds
Manufacturer
Jackel Inc.
Material
Polyethylene

🔧Universal retrofit fits all sump basins

🌬️Passive radon gas venting system

🛡️Heavy-duty polyethylene foam cover

128672 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal in Safety, Vent Out Worries — The Radon Dome Revolution!

SEAL OUT RADON ODORS - Effectively blocks harmful radon gas and unpleasant smells for a safer home environment.
MAINTENANCE FRIENDLY DESIGN - Includes viewing window and removable grommets for easy sump pump inspection and wire management.
DURABLE WEATHER RESISTANT BUILD - Made from tough polyethylene structural foam designed to withstand pressure and elements.
EFFORTLESS RETROFIT INSTALLATION - No need to dig or replace your sump basin—simply swap the cover and secure in minutes.
IDEAL FOR PROPERTY TRANSFERS RENTALS - Boosts home safety and compliance, making it a smart choice for real estate and rental properties.

The JACKEL Original Radon Sump Dome (SMR16101-CV) is a robust polyethylene foam cover designed to retrofit over existing sump or sewage basins. It provides a secure, airtight seal that passively vents radon gas, improving indoor air quality without costly floor excavation. Easy to install and maintain, it features a viewing window and wire grommets, making it perfect for homeowners, property managers, and rental properties seeking reliable radon mitigation and odor control.

Specifications

ASIN	B073V3RV5X
Best Sellers Rank	#76,023 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #67 in Water Pump Accessories
Brand Name	Jackel
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (601)
Global Trade Identification Number	00856201007092
Included Components	cover
Item Dimensions L x W x H	28"L x 28"W x 4"H
Item Type Name	The Original Radon / Sump Dome (Model: SMR16101-CV)
Item Weight	10.8 pounds
Manufacturer	Jackel Inc.
Manufacturer Part Number	SMR16101 #2
Material Type	Polyethylene Structural Foam
Model Number	SMR16101-CV
Power Source	Manual
Product Style	Submersible
Specific Uses For Product	Basement and garage sump basin cover, property transfers, rentals
UPC	856201007092
Unit Count	1 Count

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