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Mack and Volvo with Low Sulfur PNG Tanks, 2-7/8
Mack and Volvo with Low Sulfur PNG Tanks Locking Fuel Cap FTA-C-722L

Mack and Volvo with Low Sulfur PNG Tanks, 2-7/8" ID, Locking Fuel Cap FTA-C-722L

Your Price: $59.00
Mack and Volvo with Low Sulfur PNG Tanks, 2-7/8" ID, Locking Fuel Cap FTA-C-722L
Part Number: FTA-C-722L
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FTA-C-722L Locking Diesel Fuel Cap
Safety chain and crossbar included.
Designed for use only on vehicles equipped with properly vented fuel systems.
Non-Vented Cap, 3.0"-8 UNNS Threads. Measures 2-7/8" across threads.

This is the cap used on Mack and Volvos with the Low Sulfur PNG Style Tank
mfg # 90-04776-01

Checking your original non-locking cap you will see one of these numbers on the inside if it is a PNG tank:  21118646, 16MF333M or 90-03948-01.

For Mack and Volvo trucks with 3-3/8" fill neck see FTA-C-69