1/8in fittings are standard on X-7 RT Systems. (Not cyclone feed systems.) These 1/8in versions are now coming stock on A-5 RT Systems. - November 2007 This is the 1/8in version. Tippmann Sports says it isn't necessary but many people want to upgrade to these 1/8in fittings for better air flow.

RT Flow Control Valve 1/8 Inch on the Tippmann 98 Custom ACT RT Diagram
RT Flow Control Valve 1/8 Inch on the Tippmann 98 Custom ACT RT Pro Diagram
RT Flow Control Valve 1/8 Inch on the Tippmann 98 Custom Pro RT Diagram
RT Flow Control Valve 1/8 Inch on the Tippmann 98 Custom Platinum Series RT ACT Parts Diagram
RT Flow Control Valve 1/8 Inch on the Tippmann 98 Custom RT Response Trigger Installation Manual 2006-09-17
RT Flow Control Valve 1/8 Inch on the Tippmann A-5 RT Kit Diagram
RT Flow Control Valve 1/8 Inch on the Tippmann A-5 RT Body Diagram v2 2009-09-04
RT Flow Control Valve 1/8 Inch on the Tippmann X7 RT Diagram