Does it fit all hot tub models?

No; They specifically fit Watkins Hot Spring 3.5" standpipe caps; includes 1 gray cap replacing part 36513 for your silver ion line and 2 white caps replacing part 31389; please verify your model compatibility before ordering

Is it easy to install?

Yes; tool free installation takes less than a minute; simply power off your hot tub; unscrew your old brittle cap counterclockwise; thread your new replacement cap on clockwise until hand tight for a straightforward stable fit

How often to replace?

These caps typically last two to three years; replace them immediately if you notice surface cracking or structural brittleness from heavy chemical or UV exposure; proactive replacement ensures your filter remains locked down safely

Why you might like this?

This 3-pack delivers exact color unified matching at a fraction of factory cost; made of reinforced PP to lock filters vertically; features zero chemical conflicts with saltwater systems while protecting your pump from bypass debris

What happens if I don't replace a brittle or cracked standpipe cap?

Cracked or brittle caps allow loose debris to bypass filter pleats and flow into plumbing lines; presents an immediate risk of catastrophic heater or pump clogging; replacing your caps proactively safeguards your hot tub investment

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3-1/2" Stand Pipe Caps for Watkins Hot Spring Spas, 3-Pack

3-1/2" Stand Pipe Caps for Watkins Hot Spring Spas, 3-Pack

Product ID: 392273651

Details

Brand
HOTUBJOY
Color
White Grey
Product Dimensions
1.7"L x 3.2"W
Material
Reinforced
Shape
Round

🎨Exact color-coded caps for easy visual ID

🔧Tool-free, hassle-free drop-in installation

🛡️Reinforced break-resistant polypropylene housing

NZ$74

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
HOTUBJOY
Color
White Grey
Product Dimensions
1.7"L x 3.2"W

Description

🛁 Lock in luxury, block out debris — spa care made effortless!

DEBRIS DEFENSE SYSTEM - High-precision threaded caps block dirt and debris, safeguarding your spa’s inner plumbing.
PRECISION COLOR CODING - Gray & white caps eliminate guesswork, streamlining your spa maintenance routine.
SECURE ANTI FLOAT LOCK - Keeps your filter stable and water flowing cleanly, preventing costly pump damage.
DURABLE REINFORCED BUILD - Premium polypropylene resists cracking, chemicals, and heat for long-lasting spa protection.
SEAMLESS SPA COMPATIBILITY - Perfectly engineered to replace original Watkins Hot Spring Spa parts 36513 & 31389.

The HOTUBJOY 3-Pack 3-1/2" Stand Pipe Caps are precision-engineered replacements for Watkins Hot Spring Spas, featuring color-coded, reinforced polypropylene caps that resist harsh chemicals and heat. Designed for tool-free installation, these caps prevent debris entry and secure your spa filter to protect pumps and heaters, ensuring a flawless, worry-free spa experience.

Specifications

Brand	HOTUBJOY
Color	White
Item Dimensions L x W x H	3.2"L x 3.5"W x 1.7"H
Material	Plastic
Material Type	Plastic
Model Name	3-1/2" Cap
Product Dimensions	3.2"L x 3.5"W x 1.7"H
Shape	Round

Reviews

J**F

Great product

Perfect fit

30.05.2026

A**E

Perfect fit

Perfect fit for my hot springs tub

26.07.2026

M**N

Perfect fit just like oem

I have a hot springs tx2 I bought used and it was missing the filter cap. These fit perfectly

14.07.2026

J**Z

Filter Caps

Parts fit right on. NP's

10.07.2026

D**.

Perfect replacement

Perfect replacement for my aged hot springs tub!

13.11.2025

J**.

Strap Clips

Two of the plastic strap clips broke the first day. I wish they would use better/stronger clips for the tie downs.

20.11.2024

B**D

Fit as hoped for

Gathers unwanted items to keep water clean and free of bugs

18.04.2026

L**A

Worked fantastic!

8.05.2026

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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.

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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.

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NZ$74

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered 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 New Zealand.

Secure transaction

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