Seals-It Firewall Grommet 2-Hole 5.250 x 1.50 O.D. Blank ProTru by Wiseco Large-diameter 3-1/2" gauge face indicates

Large-diameter 3-1/2" gauge face indicates percentage of leakage rather than psi

C4-R4 Valve

1971-1974 Chevrolet C10 Pickup

#4241 wont fit 1991 and later big-block Gen V & VI engines

stop sooner and pack very easily by one person in 4 or 5 minutes

Seals-It Firewall Grommet 2-Hole 5.250 x 1.50 O.D. Blank ProTru by Wiseco Large-diameter 3-1/2" gauge face indicatesProduct Description: Firewall Grommet Blank 5. 250 x 3 in Aluminum Rubber Black Sold Individually From asphalt and dirt track racers Seals It rod end seals get the job done. In business for over 25 years, Seals It manufactures seals, grommets, and other automotive products for many industries including NASCAR, motorsports, and 4x4 off road vehicles, as well as agricultural, aerospace, transportation, and other applications.