they worked great i use the to cover the pipes on my pool heater so nothing can get in the pips they work great

will these fit over a piece os 1/2' pvc pipe

No the 1/2” PVC is 1/2” inside diameter you would need more like a 3/4” cap for the 1/2” PVC

I am looking for caps to fit iron pipe whose nominal OD is 0.84 inches. Is this size sufficient?

I doubt it highly, you are .09 inches larger than the caps. They are only 3/4" .75 inch

Will these stretch enough to fit a post that is 2 3/8”?

The 2" cap will not stretch on to a 2 3/8" post. Our 2 1/4" cap will stretch to 2 3/8" OD post with a little effort. Here's the link to the 2 1/4" cap. www.amazon.com/gp/product/B01L2VTGB4

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3-Inch (75mm) Round Rubber Plugs, Flexible Black End Caps for Holes, Metal Tubing, and Furniture, Durable Protective Covers, Made in USA - 4 Pack

Product ID: 125939239

Details

Brand
Prescott
Color
4 Pack
Material
Plastic
Shape
Round
Surface Recommendation
Hardwood

📏Fits 3" OD tubes with stretch-fit

🌧️Weatherproof & durable build

🛠️Snap-in design for easy install

S$46

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖤 Seal the deal with durable style and protection!

PROUDLY MADE IN THE USA - Crafted to meet rigorous quality standards, ensuring long-lasting reliability.
PRECISION FIT NO HASSLE - Snugly fits 3" outside diameter tubes with up to 1/16" stretch—no tearing, no slipping.
BUILT TO BRAVE THE ELEMENTS - Premium rubber withstands harsh weather and heavy foot traffic without degrading.
EFFORTLESS SNAP IN INSTALLATION - Quickly secure plugs without tools, perfect for fast project upgrades or repairs.
ULTIMATE FLOOR FURNITURE PROTECTION - Ribbed design prevents scuffs and damage on wood floors and furniture legs.

Prescott Plastics 3-Inch Round Rubber Plugs are flexible, weather-resistant end caps designed to fit snugly on 3" OD tubes and pipes. Their ribbed, snap-in design protects floors and furniture from damage while enduring harsh conditions. Made in the USA, these durable plugs offer a reliable, easy-to-install solution for both indoor and outdoor projects.

Specifications

ASIN	B07PDSPTYP
Best Sellers Rank	#19,043 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #92 in Hardware Plugs
Brand Name	Prescott Plastics
Color	4 Pack
Customer Reviews	4.5 4.5 out of 5 stars (4,302)
Grip Material	Rubber
Item Dimensions L x W x Thickness	3"L x 3"W x 1.5"Th
Manufacturer	Prescott Plastics
Material Type	Plastic
Number of Items	4
Number of Pieces	4
Recommended Uses For Product	Bench, Chair, Sofa, Stool, Table
Shape	Round
Surface Recommendation	Hardwood
UPC	704022770476
Unit Count	4 Count

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