Winter Rubber Expansion Plug #4 w/ White Nylon Wing Nut for 3/4" & 1" Pipe | SP-204
Technical Products
SKU: SP-204
Technical Products SP-204 Winter Expansion Plug #4 – For 3/4" Tube
The Technical Products SP-204 is a #4 rubber winter expansion plug designed to seal 3/4" inside-diameter (ID) lines/tubes during pool winterization. Tightening the wing nut compresses the rubber, causing it to expand and grip the inside of the pipe to create a secure, watertight seal that helps keep water out after the line is blown out.
Key Features
- Fits: 3/4" ID tube/line (common winterizing size)
- Expansion seal: Rubber compresses/expands as the wing nut is tightened
- Wing nut tightening for quick install and removal (no tools typically required)
- Helps protect plumbing from freeze damage by keeping water from re-entering the line
- Durable rubber body designed for seasonal use
Specifications
- Manufacturer: Technical Products
- Part Number: SP-204
- Plug Size: #4
- Application: Winterizing / line sealing
- Line Size: 3/4" ID (verify your opening size before ordering)
Common Uses
- Sealing small pool plumbing lines after blowing out water
- Blocking accessory ports and small return/feature lines that match a 3/4" internal diameter
- General-purpose seasonal sealing for compatible 3/4" tubes/ports
Installation Notes
- Insert the plug into a clean, dry pipe opening.
- Tighten the wing nut until the rubber expands and seals firmly.
- Do not overtighten—tighten only until snug and leak-free.
- Remove in spring by loosening the wing nut and pulling the plug straight out.
Related Products
- Technical Products SP-204 (Shop / Options)
- Technical Products Winter Plugs (Other Sizes)
- Pool Winterizing Kits
- Air Blowout Adapters & Fittings
- Skimmer Protection Gizmos
- Thread Seal Tape
Maintenance Tips
- Measure the inside diameter of the line opening to confirm size—winter plugs are sized by the hole they seal.
- After tightening, confirm the plug is secure and not able to be pulled out easily.
- Store plugs clean and dry in the off-season to extend rubber life.
- If the rubber is cracked, stiff, or won’t expand evenly, replace the plug before winterizing.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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