Daptemn Expandable Freeze Rubber Plug Kit, 16PCS 8-Size (19–44mm) Neoprene & Alloy Steel Seal

Daptemn 16PCS Expandable freeze rubber plugs are a ready-to-install neoprene expansion plug kit designed to seal and temporarily repair engine core plugs, tubes and general-purpose holes ranging from 19 mm to 44 mm.

This compact kit brings eight different expandable rubber freeze plug sizes with two pieces each, plus the metal hardware needed to anchor them. Each plug uses a neoprene rubber body and alloy steel fasteners that expand inside a hole to create a tight seal. The set is sorted in a plastic storage box so you can quickly find the right size for automotive engine freeze plugs, radiator openings, or general plumbing and fabrication tasks.

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

The kit contains 16 plugs across eight nominal sizes, arranged to match a steady size range so you can cover many common repair needs. Each size ships with two identical plugs to handle multiple openings or provide a spare.

• 2 × 3/4" plugs — fits 3/4" to 7/8" (19–22 mm)
• 2 × 7/8" plugs — fits 7/8" to 1" (22–25 mm)
• 2 × 1" plugs — fits 1" to 1-1/8" (25–28 mm)
• 2 × 1-1/8" plugs — fits 1-1/8" to 1-1/4" (28–31 mm)
• 2 × 1-1/4" plugs — fits 1-1/4" to 1-3/8" (31–34 mm)
• 2 × 1-3/8" plugs — fits 1-3/8" to 1-1/2" (34–38 mm)
• 2 × 1-1/2" plugs — fits 1-1/2" to 1-5/8" (38–41 mm)
• 2 × 1-5/8" plugs — fits 1-5/8" to 1-3/4" (41–44 mm)

How do these expandable rubber plugs install and stay sealed?

Installation is mechanical and simple: insert the plug into the hole, tighten the carriage bolt and hex nut to expand the steel chassis against the neoprene body, creating a compression seal. The expanding hardware increases radial pressure while the O-ring and smooth rubber face help prevent leaks.

• Insert plug into opening and hand-start bolt
• Tighten hex nut to expand the steel chassis and compress neoprene
• O-ring provides an extra barrier for liquids and gases
• Removable for future service or replacement

What materials and quality features protect against leaks and wear?

Daptemn freeze plugs use neoprene rubber for elasticity and a smooth, burr-free finish to seat cleanly; alloy steel plates, chassis and carriage bolts provide the expansion force and long-term strength. The combination reduces the chance of oil or coolant seepage when installed correctly.

• Neoprene rubber body resists oil and many common fluids
• Alloy steel hardware for consistent expansion and retention
• Smooth, defect-free rubber face for reliable contact
• O-ring seal for improved leak resistance

Where else can these plugs be used besides engine freeze plugs?

While designed with automotive core plugs in mind, these expandable rubber plugs work for a wide range of sealing tasks. They are a handy option for temporary repairs, maintenance, fabrication closures or stopping liquid and gas leaks when a permanent repair will be scheduled.

• Temporary radiator and coolant passage sealing during diagnostics
• Plumbing or piping test plugs for workshops and garages
• Sealing holes in sheet metal, alloy housings, and tanks
• General workshop and construction patching where a removable plug is useful

Who is this for? The Daptemn 16PCS Expandable Freeze Rubber Plugs kit is aimed at DIY mechanics, home garage owners, professional technicians and fabrication shops that need a compact, versatile set of plugs for engine freeze plugs and general sealing jobs. If you routinely service engines, perform cooling-system work, or need a portable assortment of removable seals to temporarily stop leaks, this kit provides multiple sizes, spare units and a dedicated storage box to keep parts organized and ready for action.