Siptenk Expandable Freeze Rubber Plug Kit 27pcs — 13 Sizes (3/4"–2-3/8") Neoprene & Steel Seals in Case

Siptenk 27-piece expandable freeze rubber plug kit is a complete assortment of neoprene-and-steel expansion plugs that seal a wide range of round openings from 3/4" to 2-3/8" with fast, reusable installation.

This kit brings 13 different plug sizes plus the necessary hardware and a compact plastic case, making it a ready-to-use solution for mechanics, home DIYers, and technicians who need temporary or permanent seals for engine freeze plugs, exhaust test ports, pressure checks, or custom plumbing stops. Each plug combines flexible neoprene rubber with alloy/steel components to expand securely when the carriage bolt and hex nut are tightened, and the clear organizer keeps each size protected and easy to find.

What sizes are included and which hole diameters do they fit?

The kit contains 27 pieces across 13 nominal plug sizes, covering hole fits from 3/4" (19mm) up to 2-3/8" (60mm). Each plug type is sized to seal a specific range of hole diameters so you can pick the closest match for a tight fit before expansion.

• 3/4" plugs fit 3/4"–7/8" (19–22mm)
• 7/8" plugs fit 7/8"–1" (22–25mm)
• 1" fits 1"–1-1/8" (25–28mm)
• Other sizes included up to 2-1/4" type fitting 2-1/4"–2-3/8" (57–60mm)

How do these expandable rubber plugs work and what parts are supplied?

Each plug consists of a neoprene rubber sleeve and a steel alloy core that expands when the carriage bolt is tightened against a steel plate and hex nut. The kit supplies the internal hardware so a plug can be compressed radially to form a secure seal inside a round opening.

• Components per plug: neoprene rubber sleeve, steel chassis, steel plate, carriage bolt, O-ring, hex nut
• Tighten the nut on the carriage bolt to expand the rubber outward against the hole walls
• O-ring helps maintain the seal and prevents metal-on-metal wear

Are these plugs durable and suitable for repeated use?

The neoprene rubber offers elasticity and resistance to oils and common workshop fluids, while alloy/steel parts give structural strength during expansion. Proper installation and avoidance of excessive torque will allow the plugs to be reused several times for testing and temporary sealing jobs.

• Neoprene resists oil and moderate temperatures typical in mechanical applications
• Steel components provide high hardness and impact resistance
• Packaged in a protective plastic storage case to prevent damage and loss

How easy is installation and what applications are typical?

Installation is straightforward: remove any old seal, insert the selected plug, then tighten the hex nut to expand the rubber until the plug is snug. The kit is commonly used for replacing rubber freeze plugs, conducting pressure or exhaust tests, and temporarily capping round openings in repair or fabrication work.

• Quick installation with basic hand tools — wrench required to tighten hex nut
• Used for engine freeze plug replacement, exhaust pressure testing, or temporary port sealing
• Plastic case keeps all sizes organized and transportable for shop or field work

Who is this for: The Siptenk 27-piece expandable freeze rubber plug kit is suited to professional mechanics, automotive hobbyists, maintenance techs, and DIY homeowners who need a compact, multi-size set for sealing, testing, and temporary blocking of round holes. If you work with engines, exhaust systems, plumbing, or metal fabrication and value a reusable, organized assortment of plugs, this kit supplies the sizes and hardware to cover most small-to-medium diameter sealing tasks.