EFS Pro – Envelope Sealer / Feeder is so Convenient, Fast and Easy to set-up you will never want to deal with the mess of manually sealing envelopes again! With the EFS Pro you can seal A5 envelope up to a 10×13 and with various types of flaps, the EFS Pro will provide consistent feeding and flap sealing quality. Yes! we said various types of flaps! Even those square invitation flaps that jam on most automatic sealers. Changing envelopes to run a new sealing job is fast, easy and can be done in a matter of seconds.