This is a pack of two replacement ProTek R/C Large Mid Needle O-Rings for RM.1, RM, 321B, S03 and R03 engines. The Mid Needle requires the use of one large and one small o-ring (PTK-2534) for operation.
This product was added to our catalog on November 6, 2014
- ProTek R/C Samurai 321B
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