everyone says Proflex PVC to PVC shielded couplings are the way to go for under slab wye tie in for a new basement bathroom..but i keep reading they are not rated for direct dirt contact, as they will be under at least 12 inches of dirt with a 4" concrete top poured back over them. Why doesn't a guy use PVC slip couplings to connect? and are the Proflex (or similar type) rated for concealment in dirt?
PROFLEX SPECIALTY COUPLINGS
( Not recommended for direct burial)
Edit added after reading post below.Designed for resistance to heavy earth loads and shear forces, and provides improved pipe alignment.Proflex allows you to make transition pipe connections that are resistant to shear forces, while creating a rigid, long-lasting pipe joint. From 1 ½" to 8" - PROFLEX connects cast iron, plastic, steel, copper and tubular, drain waste and vent systems.
- Gasket Material: Neoprene
- Gasket ID: Part No. and application on each gasket.
- Shield Assembly Material Requirements: All 300 Series S.S.
- Band = 301 Stainless Steel .025 x .500 x Length
- Housing = 301 Stainless Steel - Fernco
- Screw = 305 Stainless Steel 5/16" Hex - No Slot
- Shield - 301 Stainless Steel .012 x 2.125 x Length
- Eyelet - 305 Stainless Steel
- Installation Torque = 60" lbs.
- Maximum test pressure: 4.3 PSI (29.6KPA)
- Maximum operating temperature: 180° F
- Conforms to the requirement of ASTM C1460