This is the Gundlach 4 Series Edge Sealing Tip with the left side glue opening.
The 4RS has a glue opening that is on the left side of the edge sealing tip, which makes it ideal for right handed use. The 4RS Carpet Edge Sealing Tip allows you to easily seal edges, using any hot melt glue, so that carpet edges don't fray during carpet seaming. The 4RS tips have 3/8"-16 internal threads and are 1/2" diameter x 1-1/4" long. The No. 3630 Adapter Valve with Lock Nut (or an equivalent) is usually required to attach the 4 Series Tips to a glue gun. No. 3630 Adapter Valve with Lock Nut sold separately.
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