8 Fairfax St SE
NAPA Auto Parts Genuine Parts Company
8 Fairfax St SE
Leesburg,  VA  20175
(703) 777-2055
Reserve Online Participant
Store Hours
Mon-Fri:7:30 AM-7:00 PM
Sat:8:00 AM-5:00 PM
Sun:9:00 AM-5:00 PM
This store has been geolocated for you.
Looking to get a repair done? Find an AutoCare Center

Bar's Leaks Block Seal Head Gasket Fix
Added To Cart

Bar's Leaks Block Seal Head Gasket Fix

Part #: NCB 01111
Line: NAPA Consumer Brands

This item is currently not at your store, but is available for order. Please call store to verify the specific location and delivery details for this item. Note that additional shipping charges may be required.

Requested quantity is not available. Please update the quantity below.

Recommended Items   

Features & Benefits

Warranty: Standard : No Warranty, Expressed or Implied


Bar's Leaks Block Seal Head Gasket Fix is the easiest solution to stop head gasket coolant leaks. No draining of the cooling system is required. One step formulation contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate gaps and cracks then harden to permanently stop leaks. This works because of the extreme heat inside the combustion chamber (5000°F) that acts as a catalyst to permanently harden the material to make it stronger than the actual head gasket itself. Your vehicle is a good candidate for this product if it can idle for 20 minutes without overheating or having to add coolant. Use on ALL water cooled gasoline and diesel engines. Heavy duty formula works on aluminum and cast iron heads & blocks, along with sealing all other engine cooling system leaks better than a traditional stop leak. This includes repairing head gaskets, cylinder heads, intake gaskets, cracked blocks and freeze plugs. Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.

  • Safely Seals Gasket And Other Severe Leaks
  • Quickly and Permanently Stops Coolant Leaks
  • One Step—No Draining Required—Easy To Use
  • Use with ALL types of traditional or extended life coolant


Brand Bar's Leaks
Container Size 24 fl oz (US)
Volatile Organic Compound (VOC) Rating 0 VOC
Concentrate;Ready To Use Ready To Use
Acts as Stop Leak Yes
Contains VOCs No
Manufacturer Bar's Leaks
Manufacturer Part Number 1111
VMRS Code 053999003
SDS Required Yes

Safety Information

Vehicle Fitment Guide

Product Reviews