Western Medica Oxygen Regulators (M1-540-P). Most used but in like new condition, 2 brand new unused in factory boxes. $75 + GST each for new regulators $50 + GST each for used regulators Manufacturer details: http://westernenterprises.com/wp-content/uploads/2016/01/WPDS10071.pdf All sales subject to 5% GST charge not included in above price.