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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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
Material
Polyethylene

🏠No-dig basement install

⚙️Universal retrofit fit

🛡️Heavy-duty radon & odor seal

Description

🛡️ Upgrade your basement’s defense with the original radon sump dome—safety made simple.

TOP DISCHARGE VENT - Engineered for passive radon mitigation with efficient venting.
EFFORTLESS RETROFIT - Fits over any existing sump or sewage basin—no costly floor excavation needed.
DURABLE LIGHTWEIGHT - Only 10.8 lbs yet built to last, combining strength with easy handling.
SEAL OUT RADON ODORS - Heavy-duty polyethylene foam locks in safety and peace of mind.
UNIVERSAL COMPATIBILITY - One cover fits all standard basins, perfect for property transfers and rentals.

The JACKEL Original Radon Sump Dome (Model SMR16101-CV) is a heavy-duty polyethylene structural foam cover designed to seal existing sump and sewage basins against radon gas and odors. It features a top discharge vent for passive radon mitigation and installs easily without floor excavation, making it ideal for retrofits, property transfers, and rentals. Measuring 28" x 28" x 4" and weighing 10.8 pounds, it offers universal compatibility and durable protection.

Specifications

Asin	B073V3RV5X
Best Sellers Rank	#81,726 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #61 in Water Pump Accessories
Brand Name	Jackel
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (614) 4.6 out of 5 stars
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
Manufacturer Part Number	SMR16101 #2
Material Type	Polyethylene Structural Foam
Model Number	SMR16101-CV
Number Of Items	1
Number Of Packs	1
Power Source	Manual
Product Style	Submersible
Specific Uses For Product	Basement and garage sump basin cover, property transfers, rentals
Unit Count	1 Count
Upc	856201007092

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