If the ID of my well pipe is 6 and 3/8 will this tighten down enough ?

It’s made for a 6 in pipe, yes it will tighten

Can I hang a 3hp pump and 500’ of boreline off of this?

If your 3hp pump will fit the 6" caseing then this well cap will work for you. I used 1" outlet from my well pump.

Ws400125p | Desertcart Mexico

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

🔧 Seal your well, secure your flow – the pro’s choice for flawless water systems!

PRECISION FIT FOR 4 WELL CASINGS - Engineered to snugly seal standard 4-inch inside diameter well casings, ensuring leak-proof performance.
HEAVY DUTY MOLDED PVC CONSTRUCTION - Durable ABS plastic combined with zinc-plated steel for long-lasting corrosion resistance and strength.
OPTIMIZED 1 1 4 DROP PIPE COMPATIBILITY - Designed specifically for 1-1/4 inch drop pipes, perfect for submersible or jet pump setups.
USER FRIENDLY INSTALLATION MAINTENANCE - Retaining nuts enable quick, secure installation and effortless removal, saving you time on site.
TRUSTED INDUSTRY CHOICE WITH PROVEN QUALITY - Backed by a 4.4-star rating and top 60 ranking in water pump accessories, join thousands who rely on Merrill.

The Merrill MFG 4" Well Seal Cap with Single Top Plate is a heavy-duty, precision-engineered solution for sealing 4-inch well casings. Featuring a 1-1/4" drop pipe size, molded ABS plastic construction, and zinc-plated steel components, it ensures durability and corrosion resistance. Its retaining nuts provide secure, easy installation and removal, making it ideal for submersible or jet pump applications. Highly rated and trusted by professionals, this well seal cap delivers reliable performance and peace of mind.

Specifications

ASIN	B09MGD5LF5
Best Sellers Rank	#63,862 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #54 in Water Pump Accessories
Brand	Merrill
Brand Name	Merrill
Color	White
Connector Type	Cap
Customer Reviews	4.4 out of 5 stars 132 Reviews
Exterior Finish	Zinc
Manufacturer	Merrill Manufacturing Company
Manufacturer Part Number	WS400125P-A
Material	ABS plastic , zinc-plated steel
Material Type	ABS plastic, zinc-plated steel
Model Number	WS400125P-A
Number of Pieces	1
Size	1.25 inches
Thread Size	4
Thread Type	UNF
UPC	642367451707
Unit Count	1 Count

Reviews

W**E

Replaced a old cast iron one

Fit the casing perfect

17.11.2025

K**S

Needed 5” cap

Quality clean work

17.11.2025

R**P

Merrill 6" Well Seal Cap with 1 1/4" drop pipe

perfect for the required application

28.03.2026

A**N

Well head seal

What i ordered good product

13.03.2026

A**C

Does the job it is intended to do!

Installed this along with a new well pump at the ranch and it worked exactly as it was supposed to.

1.02.2026

D**D

Works

Worked great on my 4 inch pipe on my shallow well.

12.11.2025

N**N

Avoid

Complete junk. This is within a month of purchase. Cracked and would not hold the well pipe. This is now a several hundred dollar repair. But a better quality item.

12.03.2026

J**.

Well cap

Fit perfect looks great. I have another well that I’m going to pull up and will buy it again.

2.01.2025

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

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MX$2228

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Mexico.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago