Silicone Sealing Washers 20–50mm – Aquarium & Irrigation Gaskets

Food-Grade Silicone Seal Gaskets for Aquarium, Fish Tank & Garden Irrigation

Keep your water systems leak-free with these durable, food-grade silicone sealing washers. Designed to create a reliable watertight seal on drain pipes, PVC flanges, and garden irrigation connectors, these gaskets are built to last in demanding wet environments. Available in inner diameters of 20, 25, 32, 40, and 50mm, they fit a wide range of standard pipe connectors and fittings.

Whether you're setting up a freshwater aquarium, managing a koi pond drain system, or connecting garden irrigation lines, these milky-white silicone gaskets deliver consistent, flexible sealing performance across extreme temperature ranges.

Key Features

• Food-Grade Silicone Material: Safe for aquarium and irrigation use — no harmful chemicals or leaching.
• Wide Temperature Range: Rated from -40°C to +200°C (-40°F to 392°F) for year-round reliability.
• Multiple Size Options: Available in 20mm, 25mm, 32mm, 40mm, and 50mm inner diameters to match standard pipe fittings.
• Pressure Rated: Supports up to 850 kPa — suitable for most residential and light-commercial water systems.
• Flexible Quantity Packs: Order from as few as 5 pieces up to 200 pieces — great for single projects or bulk stocking.
• Custom Sizes Available: Need a non-standard size? Contact us with your required outer diameter, inner diameter, and thickness.
• DIN Standard Compliance: Manufactured to DIN standards for consistent quality and fitment.

Specifications

Common Applications

• Aquarium and fish tank drain pipe connections
• Garden irrigation pipe sealing
• Water pump inlet/outlet sealing
• PVC flange connectors in water features and ponds

Bulk & Custom Orders

We welcome wholesale and large-quantity orders. If you require a custom size, simply contact us with the outer diameter (mm), inner diameter (mm), and thickness (mm) you need, and we'll prepare a tailored quote for you.

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Frequently Asked Questions

Q: What inner diameter sizes are available for these silicone sealing washers?

A: These silicone gaskets are available in five standard inner diameters: 20mm, 25mm, 32mm, 40mm, and 50mm. If you require a non-standard size, you can request a custom size by providing the outer diameter, inner diameter, and thickness measurements.

Q: Are these silicone washers safe to use in aquariums with live fish?

A: Yes. These washers are made from food-grade silicone material, making them safe for use in aquariums, fish tanks, and other water systems where safety and material purity are important.

Q: How many pieces can I order, and is bulk purchasing available?

A: You can order anywhere from 5 to 200 pieces per order. Wholesale and bulk pricing is available — please contact us directly for large-quantity pricing and shipping options to ensure the most cost-effective solution for your needs.

Q: What is the maximum operating temperature for these gaskets?

A: These silicone sealing washers are rated for use across a temperature range of -40°C to +200°C (-40°F to 392°F), making them suitable for both cold-water irrigation systems and higher-temperature applications.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.