Nashfuel Propane Tank Service Valve Pv2004G Rego Style Coupler Opd Grill Bbq Overfill PROPANE TANK VALVE - Nashfuel propane tank service valve PV2004G. REGO STYLE - Rego style connection and POL connection. APPLICATION - Replacement style valve for OPD applications. FOR STEEL TANK - This is a replacement for a steel 20 lb. tank. DIMENSIONS - 5.98 L x 3.62 W.