The Mark IV economy foot operated impulse heat sealers with electronic timer (0 to 2.5 seconds). The double seal, "D" models (VHIFD IV 458 and VHIFD 608) have sealing elements on both the top and bottom jaws that produce a strong 8mm wide seal for sealing extra thick bags and difficult products such as powders, flour, fertiliser and wet items, such as fish.
The Mark IV economy foot operated impulse heat sealers with electronic timer (0 to 2.5 seconds). The double seal, "D" models (VHIFD IV 458 and VHIFD 608) have sealing elements on both the top and bottom jaws that produce a strong 8mm wide seal for sealing extra thick bags and difficult products such as powders, flour, fertiliser and wet items, such as fish.
