40MM NATO (RD40x1/7) Coupler Set ============================= This prototype design for a 40MM NATO (RD40x1/7/DIN) gas mask thread coupler set, for male to female or female to male; male to male; and female to female couplings. Designed to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer’s respirators, during this PPE shortage, in this particular instance for PAPR (Powered-Air Purifying Respirator) hose compatibility or system expansion. Or for added standoff height for 40 MM NATO filter cartridges clearances depending other manufacturers half or full face manufacture’s respirators.
Part Description: ============= MALE_TO_FEMALE_40MM_NATO_COUPLER_GEN1.stl MALE_TO_MALE_40MM_NATO_COUPLER_GEN1.stl FEMALE_TO_FEMALE_40MM_NATO_COUPLER_GEN1.stl Initial model release of three-part RD40x1/7 coupling set.
Disclaimers/Risks: ============== 1.) Requires 40 mm OD gasket or o-ring on the interior RD40x1/7 pocket to ensure proper seal maintained between cartridge and threads.
3.) 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals. 3D printing this adapter is only a temporarily ad-hoc solution against biological threats. Once supply chain return to normal users should purchase OEM OSHA/NIOSH/EN standard approved adapters and respirator accessories.
Dev. Notes: ========= 04/21/2020 - Initial model release. In work, pending support 3D printing community for any fitment and model revisions.