Siptenk Freeze Rubber Expansion Plug Kit 14PCS — 7 Sizes 3/4"–1-5/8" (19–41mm) Neoprene & Steel

This Siptenk kit supplies seven different diameter expandable rubber plugs with accompanying steel hardware and an organized plastic case so you can quickly seal a wide range of hole sizes without searching for individual parts. Each plug combines a flexible neoprene sealing sleeve with a hardened steel carriage bolt, chassis and plate that compress the rubber into a tight, removable seal. The set covers holes from 3/4" to 1-5/8" (19–41 mm), ideal for mechanics, hobbyists and maintenance pros needing a compact, reusable sealing solution.

What sizes are included and how do I match them to my hole?

The kit contains 14 plugs across seven nominal sizes that each fit a specified hole range in inches and millimeters. Choose the plug type whose listed fit range contains your measured hole diameter, then tighten the hex nut to expand the rubber until it seals snugly.

• 3/4" type: fits 3/4"–7/8" (19–22 mm)
• 7/8" type: fits 7/8"–1" (22–25 mm)
• 1" type: fits 1"–1-1/8" (25–28 mm)
• 1-1/8" type: fits 1-1/8"–1-1/4" (28–31 mm)
• 1-1/4" type: fits 1-1/4"–1-3/8" (31–34 mm)
• 1-3/8" type: fits 1-3/8"–1-1/2" (34–38 mm)
• 1-1/2" type: fits 1-1/2"–1-5/8" (38–41 mm)

How does installation work and what tools do I need?

Installation is straightforward: remove any old seal or debris, insert the rubber sleeve and steel chassis into the hole, then tighten the carriage bolt and hex nut to expand the rubber until the seal is firm. Basic hand tools are all that’s required — a wrench or socket that fits the hex nut and possibly a screwdriver for positioning.

• Tools: standard wrench or socket set
• Steps: clean hole, insert plug, tighten hex nut to expand rubber
• Time: most installs complete in a few minutes each

What are the materials and durability characteristics?

Each expandable plug combines neoprene rubber for elasticity and sealing with alloy/steel plates and bolts for compression strength and repeated use. The rubber provides a compliant contact with irregular holes while the steel components resist deformation so the plug can be tightened without failing.

• Neoprene rubber: flexible, compressible seal
• Steel/alloy hardware: high hardness for reliable expansion
• O-ring included: extra protection against leaks

Can I use this for pressure testing, coolant passages, or exhaust ports?

The Siptenk expandable plugs are designed for temporary seals, pressure tests and blocking passages during maintenance; they are suitable for many engine and plumbing openings within the specified size ranges. Avoid prolonged exposure to extreme temperatures or chemicals beyond neoprene’s resistance; always confirm compatibility with the fluid or gas you’re working with.

• Good for pressure testing and temporary seals
• Suitable for many coolant and exhaust openings
• Not intended as a permanent repair under extreme conditions

Who is this for: The Siptenk 14PCS Freeze Rubber Expansion Plug set is built for mechanics, restoration hobbyists, workshop technicians and facility maintenance personnel who need a versatile, portable kit to seal, test or temporarily block openings from 19 mm to 41 mm. If you want an organized set with multiple sizes, reusable hardware and a lightweight storage case for quick on-site repairs or diagnostic work, this kit covers common hole sizes and offers a practical mix of rubber sealing and steel strength.