Used to connect polybutylene, CPVC, or copper water lines to supply tubes. QickTite connector x compression supply. No. QBV342: 1/2" nominal (5/8" O.D.) x 3/8" O.D., 1 per bag No. QV342: 1/2" nominal (5/8" O.D.) x 3/8", 10 per bag No. QBV343: 1/2" nominal (5/8" O.D.) x 1/2" O.D., 1 per bag No. QV343: 1/2" nominal (5/8" O.D.) x 1/2" O.D., 10 per bag