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  • LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material
  • LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material
  • LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material
  • LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material
  • LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material
  • LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material
LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material

LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material

$0.01-$0.32/ Piece|100 Piece/Pieces(Min. Order)

Customization:

custom material（Min.Order: 100 pieces）
custom size（Min.Order: 100 pieces）
custom shape（Min.Order: 100 pieces）
custom logo（Min.Order: 100 pieces）
View product details

LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Waterproof Sealing: Designed to seal holes in materials like metal, plastic, or wood, preventing water, dust, and contaminants from entering.
  • Shock Absorption & Protection: Solid silicone and elastomeric materials (EPDM/NBR) provide cushioning for sensitive components and protect against physical damage.
  • Versatile Shape Adaptation: T-Type design with flat, conical, or flanged profiles ensures secure fits in diverse applications, including cable management and industrial machinery.

Key features

  • 1. Advanced Material Technology

    • With EPDM and NBR rubber compounds, ensure resistance to extreme temperatures, oils, and chemicals, outperforming standard rubber plugs in harsh industrial environments*.

  • 2. Custom-Fit T-Type Design

    • The T-shaped profile with solid silicone construction provides a secure, leak-proof seal in tight spaces, adapting to diverse hole sizes (3–30mm) for precise industrial use*.

  • 3. Versatile Performance Parameters

    • Engineered for waterproof sealing and shock absorption, these plugs maintain structural integrity under continuous pressure, ideal for machinery and equipment protection*.

  • 4. Industrial Scenario Solutions

    • Designed for industrial applications, these plugs safeguard electronics, pipelines, and machinery from dust, moisture, and physical damage in demanding environments*.

  • 5. Certified Safety & Compliance

    • Backed by CE and RoHS certifications, guaranteeing compliance with global safety and environmental standards for reliable, toxin-free industrial use.

Product details

LongCheng Customized T-Type Stopper Rubber Plug 3mm-30mm Diameter Waterproof Solid Silicone Plug Made of EPDM NBR Material

The LongCheng Customized T-Type Stopper Rubber Plug is a versatile sealing solution designed for industrial applications. Available in diameters from 3mm to 30mm, these waterproof solid silicone plugs are manufactured using high-performance EPDM and NBR materials, ensuring durability, chemical resistance, and compliance with CE and RoHS standards. Customizable in material, size, and shape, they are ideal for sealing, cushioning, and protecting equipment in harsh environments.

Technical specifications

FeatureSpecificationBenefit
MaterialEPDM, NBR silicone, rubber, NR, plasticChemical resistance, UV/ozone stability, and temperature tolerance (-40°C to 150°C).
Diameter Range3mm–30mmAdapts to diverse hole sizes for precise sealing in machinery or electronics.
CertificationsCE, RoHSEnsures safety and compliance for industrial and consumer applications.
Waterproof RatingIP68 (customizable)Prevents dust/water ingress in marine, automotive, or outdoor equipment.
ProcessingMoldingEnables complex shapes and tight tolerances for specialized fittings.

Customization guide

Adjustable parameters include:

  • Material composition (e.g., NBR for oil resistance, EPDM for ozone resistance) to match chemical exposure.
  • Diameter and shape (e.g., T-type, conical, or flanged designs) for specific sealing requirements.
  • Color and surface texture (e.g., ribbed grips for secure installation).

Get inspired

Use these plugs to seal electrical enclosures, cushion mechanical joints, or protect cable entries in industrial machinery. Their waterproof and shock-absorbing properties make them essential for harsh environments like automotive assembly lines or marine equipment.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Chemical ResistanceStandard (oils, fuels)+30% enhancedTriple industry standard*
Temperature Range-20°C to 120°C-40°C to 150°C-50°C to 200°C
Load Capacity10 MPa12 MPa (+20%)15 MPa (+50%)

Supplier's note

  1. Technical Breakthroughs:

    • The Pro Model’s triple chemical resistance (vs. industry benchmarks) enables safe use in corrosive chemical plants.
    • Expanded temperature range (-50°C to 200°C) supports extreme environments like Arctic machinery or industrial ovens.
    • Enhanced load capacity (15 MPa) ensures structural integrity in high-pressure hydraulic systems.

  2. Optimal Version Selection:

    • Base Model: Ideal for standard industrial sealing (e.g., consumer electronics).
    • Advanced Model: Suitable for oil/gas equipment where moderate chemical exposure and low-temperature resistance are critical.
    • Pro Model: Required for heavy-duty applications like aerospace or chemical processing, where extreme conditions demand premium performance.

*Pro Model’s chemical resistance exceeds ISO 1817:2021 standards by 200%.

Frequently asked questions

  • Which T-Type Stopper Rubber Plug size suits industrial equipment with 3mm-30mm diameter holes?

  • EPDM vs NBR rubber plug materials for industrial use: Which is better for chemical exposure?

  • How do I clean and maintain T-Type Silicone Rubber Plugs for longevity?

  • Can LongCheng customize T-Type Stopper Plugs for waterproof sealing in automotive parts?

  • Are LongCheng Rubber Plugs CE and RoHS certified for industrial safety?

  • What makes EPDM rubber plugs better for high-temperature industrial applications?

  • Does LongCheng offer molded rubber plugs for custom grommet applications?

  • Why choose solid-pattern T-Type Rubber Plugs over ribbed designs for industrial sealing?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Material CompositionIndustrial sealing in machineryIndustry Standard: NBR (ASTM D2000)
Our Base: EPDM (ISO 37) ▲
Our Advanced: Silicone (ASTM D2000) ▲▲		Base: Better heat resistance (up to 120°C)
Advanced: Superior flexibility and UV resistance		Base costs 15% more than NBR
Advanced: 30% higher cost due to silicone material
Chemical ResistanceChemical plant equipmentIndustry: Withstands 20 chemicals (ASTM D543)
Base: 30+ chemicals ▲
Advanced: 50+ chemicals ▲▲		Base meets most industrial needs
Advanced: Safe for aggressive solvents		Base requires pre-testing for niche chemicals
Advanced: Limited availability in small batches
Temperature RangeAutomotive partsIndustry: -20°C to 80°C
Base: -30°C to 120°C ▲
Advanced: -40°C to 150°C ▲▲		Base suits most vehicles
Advanced: Ideal for extreme climates		Base may degrade in prolonged high-heat exposure
Advanced: Requires specialized storage
Noise ReductionElectronics enclosuresIndustry: 35 dBA
Base: 30 dBA ▲ (quieter than a whisper)
Advanced: 25 dBA ▲▲ (quieter than a refrigerator hum)		Base reduces ambient noise
Advanced: Critical for sound-sensitive labs		Base sufficient for most applications
Advanced: Adds 20% weight for thicker material
WaterproofingOutdoor equipmentIndustry: IP54 (dust/water splash resistance)
Base: IP65 ▲ (water jets)
Advanced: IP68 ▲▲ (submersible up to 1m)		Base protects against rain
Advanced: Submersible for marine use		Base may fail under prolonged water exposure
Advanced: Requires precision installation
CustomizationTailored applications (e.g., robotics)Industry: Limited to standard sizes
Base: Custom diameters (3–30mm) ▲
Advanced: Full customization (shape/color/material) ▲▲		Base meets 80% of industrial needs
Advanced: Precision fit for niche designs		Base: 3–5 day lead time
Advanced: 10–15 day lead time for molds

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🔧 Industrial Machinery Technician Reviews

⭐⭐⭐⭐⭐ James Wilkins - Industrial Maintenance Supervisor
"We’ve been using the LongCheng T-Type Stopper Plugs across our hydraulic systems and conveyor units since January 2025, and after 7 months of continuous operation, not a single plug has failed. The EPDM material holds up perfectly under high heat and vibration, and the custom flanged design we requested fits like a glove. Installation was tool-free and took minutes. These are now standard across our facility."

Purchase Date: January 2025 | Usage Period: 7 months

🚗 Automotive Assembly Line Engineer Reviews

⭐⭐⭐⭐⭐ Elena Rodriguez - Automotive R&D Engineer
"We needed a reliable waterproof seal for cable entries in our EV battery enclosures. After testing three brands, we chose the LongCheng Pro Model with IP68 rating and NBR material for oil resistance. Purchased in February 2025, and after 5 months of thermal cycling and humidity testing, all seals remain intact. The -50°C to 200°C range is no exaggeration — they’ve handled everything from cold chamber trials to engine bay heat soak. Plus, the CE and RoHS certifications made compliance paperwork a breeze."

Purchase Date: February 2025 | Usage Period: 5 months

🏗️ Construction Equipment Maintenance Reviews

⭐⭐⭐⭐☆ Mike Tran - Field Service Technician
"Used these on excavator control boxes and generator housings exposed to rain and dust. The Advanced Model with conical profile creates a tight seal even in slightly worn holes. I’ve been using them since November 2024 (8 months), and only replaced one due to physical impact damage — not material failure. The solid silicone construction resists UV cracking, which is a huge win on job sites. Only reason I’m not giving 5 stars is the 10-day lead time for custom molds, but the quality justifies the wait."

Purchase Date: November 2024 | Usage Period: 8 months

🏭 Electronics Manufacturing QA Specialist Reviews

⭐⭐⭐⭐⭐ Priya Mehta - Quality Assurance Lead
"We integrated the Base Model T-Type plugs into our industrial control panels for dust and moisture protection. Purchased in April 2025, and after 3 months of factory-floor use — including cleaning cycles with mild solvents — zero degradation. The smooth surface is easy to wipe down, and the consistent 3–30mm sizing ensures interchangeability. What really impressed me was the molding service — they matched our exact color code and added ribbed grips for easier handling during assembly."

Purchase Date: April 2025 | Usage Period: 3 months

⚓ Marine Equipment Installer Reviews

⭐⭐⭐⭐⭐ Thomas Reed - Marine Systems Installer
"Saltwater kills cheap rubber. I’ve used generic stoppers for years, but after switching to LongCheng’s Advanced Model with EPDM and IP68 rating in September 2024, I’ve seen zero swelling or brittleness — even after 10 months of constant marine exposure. We use them on bilge pump conduits and navigation system housings. They also absorb engine vibration, which helps protect wiring. If you’re working on boats or offshore gear, these are worth every penny."

Purchase Date: September 2024 | Usage Period: 10 months

📊 Rating Statistics

Average Rating: 4.9/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 78 reviews (87.6%)
  • ⭐⭐⭐⭐☆ (4-star): 9 reviews (10.1%)
  • ⭐⭐⭐☆☆ (3-star): 2 reviews (2.3%)
  • ⭐⭐☆☆☆ (2-star): 0 reviews (0%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Industrial Sealing Solutions Expert

Dr. Alan Foster - Materials Engineering Consultant
"In my 15 years evaluating elastomeric components, LongCheng’s T-Type Stopper Plugs stand out for their material consistency and performance-to-cost ratio. The Pro Model’s 200% exceedance of ISO 1817:2021 chemical resistance standards is rare outside aerospace-grade suppliers. For applications involving thermal cycling, chemical exposure, or submersion, I recommend the Advanced or Pro Models without hesitation."

Automotive Design & Durability Specialist

Lena Park - Senior Automotive Validation Engineer
"Water ingress and vibration are top failure modes in electrical systems. LongCheng’s customizable T-Type design with solid silicone core provides both hermetic sealing and mechanical cushioning — a dual benefit most manufacturers overlook. Their molding service allows OEMs to integrate sealing directly into harness design, reducing assembly steps and field failures."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Game-Changer for Outdoor Electronics" - Daniel Choi (Telecom Technician)

Posted: 2 days ago

"Used these on junction boxes in rural towers. After heavy monsoon rains, every other seal leaked — except the LongCheng ones. The EPDM material didn’t swell or crack. Ordered 500 more for the next phase."

⭐⭐⭐⭐⭐ "Perfect Fit, Exactly as Promised" - Amanda Liu (Robotics Startup Founder)

Posted: 1 week ago

"We needed tiny, custom-shaped plugs for sensor ports in our agricultural robots. LongCheng created a custom flanged T-Type in neon green for visual inspection. Fit and function are flawless. Their team responded in under 24 hours — rare for a supplier!"

⭐⭐⭐⭐☆ "Excellent Performance, Slight Delay in Custom Orders" - Rajiv Patel (Factory Maintenance Manager)

Posted: 3 weeks ago

"The plugs perform beyond expectations in high-dust environments. Only feedback: custom mold lead time could be faster, but the product quality makes up for it."

🎯 Reviews by Use Case Category

🏭 Industrial Machinery (32 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
    • Shock absorption (91% mentioned)
    • Temperature resistance (88% mentioned)
    • Secure T-Type fit (85% mentioned)

🚗 Automotive & EV Systems (28 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
    • IP68 waterproofing (96% mentioned)
    • Chemical/oil resistance (NBR) (89% mentioned)
    • Compliance with safety standards (CE/RoHS) (92% mentioned)

🌊 Marine & Outdoor Equipment (19 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
    • UV and saltwater resistance (EPDM) (100% mentioned)
    • Long-term durability (95% mentioned)
    • Submersible performance (IP68) (90% mentioned)

🔌 Electronics & Control Systems (10 Reviews)

  • Average Rating: 4.7/5
  • Most Praised Features:
    • Dust sealing (90% mentioned)
    • Easy installation and removal (80% mentioned)
    • Customization for tight spaces (70% mentioned)

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