Apeks XTX50 Regulator A new silicone exhaust valve has been used on the XTX50 regulator improving breathing performance. A new swivel hose connection is available at an extra cost. This allows the demand valve end of the hose connection to rotate and pivot, providing a more comfortable fit. The ergonomic Venturi lever of the XTX50 has been designed to reduce the amount of grit ingress which in turn gives constant, smooth operation. The XTX50 2nd stage incorporates a two-shot high strength composite front cover, improving the durability of the most vulnerable part of the demand valve. Supplied with the Apeks flexible light-weight hose.