Interspiro Divator MK-II



This mask is comprised of four primary assemblies:

The Mask Body - the mask body provides the mounting surface for the regulator, head harness assembly, and face port externally and the oral nasal assembly on the interior of the mask. The mask body provides the sealing surface on the divers face as well. The composition of the mask can be either silicone or rubber and can be ordered in several colors.

The Face-Port - the face port or visor assembly is a clear high impact plastic viewing port. The newest versions of the mask have a shape designed to conform to the contours of the divers face, older designs of the mask had a face port that was higher volume and subsequently offered increased area for build up of carbon dioxide as well as increased buoyancy of the mask. The newest face port is frosted on the sides to prevent distractions within the divers peripheral vision.

 The Head Harness - the head harness provides the retaining force to keep the mask securely on the divers head. The head harness or spider assembly is comprised of five equidistant straps that attach to the mask through use of stainless steel adjustable buckles that are molded in to the mask body and is made from the same materials as the mask.

 The Demand Regulator - the regulator assembly for the mask comes in two versions, either positive pressure or non-positive pressure. The positive pressure version provides 200 pa / 20 mm water column / .03 psig of positive pressure inside the mask. The non-positive pressure version provides air in demand mode only but as an additional feature can be removed from the mask and with the addition of a mouthpiece used as a primary regulator for traditional SCUBA diving. Both units provide air to the diver with a routing system that causes the incoming air to flow past the face port on each inspiration keeping condensation to a minimum; no additional fogging preventative is required. The regulator also encompasses an internal overpressure relief designed to lift when intermediate pressure climbs to 210 +- 36 psig. The relief will reseat itself when the pressure has dropped below approximately 10 bar or 145 psi.

The Interspiro mask can be used in both surface supplied diving and SCUBA diving modes. The US Navy has restricted its use when diving surface supplied to 60 fsw or less. This due to the tolerance levels of the relief valve and the pressure decrease required to re-seat the valve.

When diving the mask in the SCUBA mode the mask is limited only by the depth limitation of the first stage regulator and air supply being used.

The mask can be outfitted with through water or hard wire communications from a variety of manufacturers.

Clearing in the mask is accomplished through use of a nose block, an adjustable rubber block that can be manipulated beneath the divers nose providing enough resistance for the diver valsalva quite easily.

The shape of the divers face determines the fit of the mask. Those with small or narrow faces can modify the sealing surface shape through use of surgical tubing or special purpose foam rubber underneath the seal. The mask will fit a large percentage of divers without modification.
The emergency procedure for this mask requires removal of the mask and insertion of an additional second stage unit or octopus assembly into the divers mouth. The mask can be re-donned underwater, remaining water will be forced out of the mask in about one second after the diver activates the positive pressure feature or purge.