Is the Nozzle set for suction gun, 474 series compatible with both long and wide crevice suction guns and made of durable plastic?

Yes. The Nozzle set for suction gun, 474 series is described as a set of nozzles (suction attachments) for a suction gun (long and wide crevice), and the material is specified as plastic. That indicates the set includes attachments for both long and wide crevice suction guns and that the nozzles are made of durable plastic.

Does the Nozzle set for suction gun, 474 series include both long and wide crevice plastic attachments?

Yes. The Nozzle set for suction gun, 474 series includes both long and wide crevice plastic attachments, as described: "Set of nozzles (suction attachments) for a suction gun (long and wide crevice). Material: plastic."

Are replacement parts available for the Nozzle set for suction gun, 474 series if a plastic attachment breaks?

No. replacement parts are not available. The Nozzle set for suction gun, 474 series is described as a set of plastic nozzles (long and wide crevice) made from plastic, and individual plastic attachments are not offered separately. If a plastic attachment breaks, the entire nozzle set will need to be replaced.