Overview Product Description Universal 3" inspect cap mounting kit provides access holding tank. Product Videos Custom Field Product Reviews Write a Review Write a Review × Dometic/Sealand Dometic/Sealand | Holding Tank Inspection Port 3" | 307238685 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments